Trump's Declaration of Unilateral Attack on Iran — "
The U.S. stance of explicitly rejecting allied support to carry out military operations against Iran overturns the premise of the collective security system that has lasted for 80 years since the war, marking a historic turning point that forces all allies, including Japan, to redefine their security.
── Understand in 3 points ─────────
- • President Trump confirmed on March 17, 2026, that military operations against Iran were underway.
- • President Trump explicitly stated that military assistance from allies such as NATO and Japan was "not needed."
- • A senior official in the Trump administration opposed the military operation, stating that "Iran was not an imminent threat," and announced their resignation.
── NOW PATTERN ─────────
The U.S.'s unilateral military action and the accompanying declaration of excluding allies form a structural turning point where three dynamics — "overstretch of power," "alliance strain," and "legitimacy void" — are interconnected.
── Probability and Response ──────
• Base case 50% — Airstrikes only with no ground troop deployment, limited Iranian retaliation, crude oil prices remaining in the $100-120 range, initiation of congressional investigations, acceleration of discussions on increasing Japan's defense budget.
• Bull case 15% — Negotiation signals from Iranian leadership, effective neutralization of nuclear facilities, de-escalation of proxy forces' activities, stable crude oil prices, activation of secret diplomatic channels between the U.S. and Iran.
• Bear case 35% — Disruption of navigation in the Strait of Hormuz, large-scale Hezbollah attacks, crude oil prices exceeding $150, expansion of anti-war protests in the U.S., official critical statements from allies.
📡 Signal — What Happened
Why it matters: The U.S. stance of explicitly rejecting allied support to carry out military operations against Iran overturns the premise of the collective security system that has lasted for 80 years since the war, marking a historic turning point that forces all allies, including Japan, to redefine their security.
- Military Action — President Trump confirmed on March 17, 2026, that military operations against Iran were underway.
- Alliance Relations — President Trump explicitly stated that military assistance from allies such as NATO and Japan was "not needed."
- Intra-administration Conflict — A senior official in the Trump administration opposed the military operation, stating that "Iran was not an imminent threat," and announced their resignation.
- Legitimacy Debate — Voices questioning the basis for the attack on Iran are rising from both within and outside the administration.
- International Law — The U.S. initiated large-scale military action unilaterally without invoking NATO's collective self-defense (Article 5).
- Regional Situation — An attack on Iran carries the risk of rapidly destabilizing the security environment across the entire Middle East.
- Energy Market — Approximately 20% of the world's crude oil shipments passing through the Strait of Hormuz face geopolitical risks.
- Impact on Japan — Japan, not being asked for support as an ally, has been confronted with fundamental questions regarding the positioning of the Japan-U.S. alliance.
- NATO Developments — NATO member states are compelled to discuss their response to U.S. unilateralism.
- Congressional Developments — Deliberations on the legality of the President's military actions under the War Powers Resolution are expected in the U.S. Congress.
- Defense Budget — The execution of unilateral military operations imposes additional burdens on the already tightening U.S. defense budget.
- Diplomatic Channels — The room for diplomatic resolution with Iran has significantly narrowed due to the commencement of military action.
President Trump's "allied support not needed" statement and unilateral military action against Iran are events that shake the very foundation of the international order built by the United States after World War II. To understand its historical context, it is necessary to look back at the evolution of U.S. alliance policy over at least 80 years.
After the end of the war in 1945, the United States established NATO in 1949 to counter the Soviet threat, and concluded the Japan-U.S. Security Treaty in 1951. These alliances were not merely military conveniences but were based on the principle of "collective security." That is, an attack on one nation was considered an attack on all member states, to be dealt with jointly. This system functioned throughout the Cold War, in the Korean War, the Gulf War, and, for the first time in NATO history, Article 5 was invoked during the Afghanistan operation after 9/11 in 2001.
However, the 2003 Iraq War created the first major crack in this trend. The Bush administration used the framework of a "Coalition of the Willing" to invade Iraq without obtaining a UN Security Council resolution. France and Germany strongly opposed this, leading to serious internal conflicts within NATO. At this point, the U.S. tendency to "selectively" utilize alliance frameworks had already become apparent.
President Trump's first term (2017-2021) further accelerated this trend. He persistently demanded that NATO member states bear 2% of their GDP in defense spending, clearly demonstrating an attitude of evaluating alliances from a "cost" perspective. He also demanded significant increases in host-nation support for U.S. forces in South Korea and Japan, treating alliances as "deals," which shocked the international community.
Entering its second term from 2025, the Trump administration went even further. While significantly reducing military aid to Ukraine and seeking direct negotiations with Russia, it strengthened unconditional support for Israel in its Middle East policy. Regarding Iran's nuclear development issue, the path to diplomatic resolution had been virtually closed after the withdrawal from the 2015 JCPOA (Joint Comprehensive Plan of Action) (implemented in the first term).
The escalating tensions surrounding Iran have multiple factors. Iran is said to have advanced its accumulation of highly enriched uranium by 2025, approaching the "threshold" of nuclear weapons manufacturing capability. Simultaneously, the activities of Iranian-backed militia groups (Hezbollah, Houthis, Iraqi Shiite militias) in various parts of the Middle East intensified, bringing tensions with Israel to a peak. However, as indicated by the resignation of a senior administration official, whether an "imminent threat" existed is highly questionable.
Historically, the "Wag the Dog" phenomenon, where a U.S. president initiates military action for domestic political motives, is not uncommon. The 1998 case where President Clinton bombed Sudan and Afghanistan amidst the Monica Lewinsky scandal is typical. In President Trump's case, there is a widespread view that he may have intended to divert public attention from domestic impeachment debates and stalled economic policies.
Even more important is the structural meaning of the declaration "allied support is not needed." This is not merely a statement limited to the current operation but signifies a rejection of post-war multilateralism. The U.S. publicly declaring that it "does not need" its allies, conversely, prompts allies to build "security systems independent of the U.S." For Japan, this could trigger extremely sensitive discussions such as the resurgence of autonomous defense arguments, further increases in defense spending, and debates over nuclear armament.
Furthermore, for NATO, this is an existential crisis. Europe has already been strengthening its own defense capabilities in the wake of the war in Ukraine, but the explicit defection of the U.S. makes the construction of a unique European security architecture inevitable. This is a phase where French President Macron's proposed "European Army" concept gains realism.
The delta: The U.S. President's official declaration that allied support is "not needed" has shattered the premise of 80 years of post-war collective security, forcing Japan and Europe into a phase where they must inevitably design "security without America." Simultaneously, the resignation of a senior administration official casts doubt on the legitimacy of the attack itself, indicating signs that the "overstretch of power" is entering a self-destructive cycle.
🔍 Reading Between the Lines — What the News Isn't Saying
The essence of President Trump's "allies not needed" statement lies not in military rationality but in political calculation. Involving allies would allow them to interfere in the operational decision-making process, information sharing, and target selection, thereby restricting the President's personal freedom of decision. In other words, it's not that they are "unnecessary," but rather "inconvenient." The resignation of a senior administration official strongly suggests that this military action was decided by the President's personal judgment, bypassing regular security processes—intelligence assessment, option consideration, and consultation with allies. There is a high probability that "cherry-picking intelligence," as seen during the 2003 Iraq War, is happening again.
NOW PATTERN
Overstretch of Power × Alliance Strain × Legitimacy Void
The U.S.'s unilateral military action and the accompanying declaration of excluding allies form a structural turning point where three dynamics — "overstretch of power," "alliance strain," and "legitimacy void" — are interconnected.
Intersection of Dynamics
The three dynamics of "overstretch of power," "alliance strain," and "legitimacy void" do not operate in isolation but form a self-reinforcing loop that amplifies each other. This interaction is precisely what makes the current situation a structural turning point beyond a mere military conflict.
First, there is a mechanism by which "overstretch of power" accelerates "alliance strain." While the U.S. undertaking excessive military commitments unilaterally may seem to alleviate the burden on allies, it actually undermines the very raison d'être of the alliance by formalizing the "unnecessary" argument for allies. The moment allies perceive they are "not needed," they move towards building their own security architecture, increasing centrifugal forces away from the alliance. For the U.S., this means the risk of not being able to obtain allied support when it genuinely needs it in the future.
Next, the "legitimacy void" further exacerbates the "overstretch of power." When the legitimacy of military action is questioned, domestic political support declines, and the sustainability of military operations is undermined. However, withdrawing from an already committed military action midway is politically extremely difficult, so military action continues despite declining legitimacy, resulting in only accumulating costs. This is the very structure of the "quagmire" in the Vietnam War.
Furthermore, "alliance strain" expands the "legitimacy void." The fact that allies do not support U.S. actions means that the international legitimacy of U.S. actions further declines. Military actions not supported even by democratic allies like NATO and Japan are unlikely to be perceived as "legitimate" actions by the international community.
The interplay of these three dynamics is a pattern commonly observed historically in the decline of empires. The vicious cycle of excessive military commitment → weakening of alliances → loss of legitimacy → increased reliance on military means was similarly seen in the late Roman Empire, the decline of the Spanish Empire, and the post-Suez decline of the British Empire. Which stage of this historical pattern the current U.S. is in will become clear in the coming months.
📚 Patterns of History
2003: U.S. Invasion of Iraq and the "Coalition of the Willing"
Military action based on domestic political motives and insufficient threat assessment led to divisions within the alliance and a loss of international legitimacy.
Structural similarities with the present: The threat of "weapons of mass destruction" was later revealed to be exaggerated or fabricated, damaging U.S. international credibility for a long time. The current official's testimony that "it was not an imminent threat" suggests a structural repetition of the Iraq War.
1956: Anglo-French Unilateral Action in the Suez Crisis
Forcing military action without the support of an ally (the U.S.) resulted in a decisive decline in international standing.
Structural similarities with the present: Britain and France succeeded in militarily recapturing the Suez Canal, but were forced to withdraw due to U.S. opposition, permanently losing their hegemony in the Middle East. Military actions that disregard allies, regardless of short-term military success, lead to long-term strategic losses.
1960-1975: The Quagmire of the Vietnam War
Military commitments continued to expand despite questions of legitimacy, ultimately leading to the collapse of domestic political consensus.
Structural similarities with the present: As the truth about the Gulf of Tonkin incident was exposed, the legitimacy of the war fundamentally collapsed. The alienation of domestic public opinion is more fatal than military defeat, and the current resignation of a senior administration official suggests the beginning of a similar process.
1979: Soviet Invasion of Afghanistan
A superpower unilaterally intervened militarily in a regional power, becoming mired in a quagmire without substantial support from allies.
Structural similarities with the present: A decade of fighting exhausted the Soviet economy and ultimately contributed to the collapse of the Soviet Union. Military superiority does not necessarily mean strategic victory.
2011: Military Intervention in Libya and Subsequent Chaos
Military intervention aimed at removing a threat was carried out without a post-intervention stabilization plan, leading to long-term regional destabilization.
Structural similarities with the present: After the collapse of the Gaddafi regime, Libya fell into civil war and became an epicenter of instability across North Africa. Military intervention without an "exit strategy" does not solve problems but creates larger ones.
Patterns Revealed by History
The common patterns revealed by these historical precedents are clear. First, military actions based on insufficient threat assessment and domestic political motives, even if achieving short-term military success, ultimately result in long-term strategic failure. Second, military actions carried out without allied support lack international legitimacy, and their maintenance costs reach unsustainable levels. Third, internal dissent regarding the legitimacy of military action, once it begins, self-propagates and ultimately undermines the entire credibility of the administration.
Particularly noteworthy is the structural similarity with the 2003 Iraq War. The denial from within the administration regarding the existence of an "imminent threat" is a repetition of the "weapons of mass destruction" intelligence manipulation during the Iraq War, and this similarity is not coincidental but structural. That is, the repeated occurrence of situations where the President's personal political will overrides the professional judgment of intelligence agencies and security organizations—"politicized intelligence"—reflects an inherent structural vulnerability in the U.S. security decision-making system. Rarely has the adage "history doesn't repeat itself, but it often rhymes" been more apt.
🔮 Next Scenarios
The U.S. conducts limited airstrikes against Iran's nuclear facilities and military infrastructure for several weeks but does not engage in large-scale ground operations. Iran retaliates with direct missile attacks and asymmetric attacks through proxy forces, but a full-scale war is avoided. Crude oil prices remain high in the $100-120 per barrel range, increasing inflationary pressure on the global economy.
Regarding the Japan-U.S. alliance, the Japanese government outwardly expresses understanding for U.S. actions but provides no substantial military support, instead accelerating the strengthening of its own security capabilities in response to the "support not needed" statement. Discussions on achieving 2% of GDP for defense spending are brought forward. Within NATO, unique European defense cooperation is strengthened, but it does not lead to a formal split of the alliance.
In the U.S., Congress initiates deliberations under the War Powers Resolution, but presidential authority is not limited due to ruling party support. Public opinion sees a temporary rise in approval ratings due to an initial "rally around the flag" effect, but this declines as the operation drags on. The testimony of the resigned official becomes the subject of a congressional investigation, and the debate over the justification for the attack becomes prolonged.
Implications for Investment/Action: Airstrikes only with no ground troop deployment, limited Iranian retaliation, crude oil prices remaining in the $100-120 range, initiation of congressional investigations, acceleration of discussions on increasing Japan's defense budget.
U.S. military operations deliver decisive blows to Iran's nuclear facilities and command-and-control systems, leading the Iranian leadership to agree to early ceasefire negotiations. President Trump demonstrates his skills as a "dealmaker," forging a new agreement with Iran to exchange nuclear abandonment for sanctions relief. This could also increase pressure on North Korea and strengthen the nuclear non-proliferation regime.
Regarding alliance relations, while short-term cracks emerge, the substantial removal of Iran's nuclear threat contributes to the interests of allies through the stabilization of the Middle East. Crude oil prices stabilize after an initial surge, and navigation safety in the Strait of Hormuz is secured. For Japan, there is an indirect benefit of improved energy security.
However, for this scenario to materialize, preconditions include Iran's military resistance being weaker than expected, limited retaliation by proxy forces, and, above all, the Trump administration possessing the will and capability to convert military victory into diplomatic achievement. Historically, the probability of these conditions being met simultaneously is low.
Implications for Investment/Action: Negotiation signals from Iranian leadership, effective neutralization of nuclear facilities, de-escalation of proxy forces' activities, stable crude oil prices, activation of secret diplomatic channels between the U.S. and Iran.
Military operations become prolonged, and Iranian retaliation unfolds on a scale exceeding expectations. Iran simultaneously executes a blockade of the Strait of Hormuz, large-scale attacks on Israel by Hezbollah, and attacks on U.S. military bases in Iraq and Syria, engulfing the entire Middle East in conflict. Crude oil prices exceed $150 per barrel, and the global economy falls into stagflation (inflation during a recession).
The Japanese economy suffers a severe blow from surging crude oil prices and supply chain disruptions. Yen depreciation pressure intensifies, and import inflation directly impacts daily life. The turmoil in the Japan-U.S. alliance following the "support not needed" statement signifies a weakening of deterrence against China and North Korea, destabilizing the security environment in East Asia.
In the U.S., anti-war movements intensify, and the administration's approval ratings plummet. Congress moves to limit presidential authority under the War Powers Resolution, potentially reigniting impeachment debates. Furthermore, nationalist sentiment among the Iranian populace rises, leading to a "backfire" effect that actually strengthens support for the current regime. The quagmire of a war initiated by the Trump administration despite "no imminent threat" impresses upon the international community that the lessons of the Iraq War were completely ignored, decisively undermining trust in U.S. leadership.
Implications for Investment/Action: Disruption of navigation in the Strait of Hormuz, large-scale Hezbollah attacks, crude oil prices exceeding $150, expansion of anti-war protests in the U.S., official critical statements from allies.
Key Triggers to Watch
- Initiation of deliberations under the War Powers Resolution in the U.S. Congress and submission of a bill to limit presidential authority: Late March to April 2026
- Implementation of a Strait of Hormuz blockade or large-scale retaliatory attack by Iran: March to April 2026 (most likely within two weeks of the start of military operations)
- Holding of an extraordinary NATO summit and discussion of a new framework for European defense cooperation: April to May 2026
- Re-evaluation of the Japan-U.S. alliance and review of defense capabilities by Japan's National Security Council (NSC): April to June 2026
- Congressional testimony by the resigned administration official and initiation of an investigation into the justification for the Iran attack: April to May 2026
🔄 Tracking Loop
Next Trigger: Congressional testimony by the resigned administration official (expected mid-April 2026) — Whether the justification for the attack is substantiated will be a watershed for future political developments.
Continuation of this Pattern: Tracking Theme: U.S. Unilateral Military Action and Structural Changes in the Alliance System — The next key milestones are the holding of an extraordinary NATO consultation and the Japan-U.S. Security Consultative Committee (2+2) in April 2026.
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