North Korea's New Missile Test — Spiral of Conflict

📡 THE SIGNAL — What Happened

Why it matters: North Korea's successful launch of a new long-range missile could be a turning point that fundamentally shakes the deterrence structure in East Asia and pushes security cooperation among Japan, the US, and South Korea into an irreversible phase. The inherent vulnerability of democracy, namely the division of domestic public opinion, is emerging as the biggest limiting factor for this alliance reinforcement.

• Military — North Korea conducted a test launch of a new long-range ballistic missile (ICBM-class) in early 2026 and announced its success. It may have recorded the highest flight distance and altitude to date.
• Military — The new missile employs a solid-fuel propulsion system, significantly reducing launch preparation time compared to liquid-fuel types and facilitating operation from a Transporter Erector Launcher (TEL).
• Diplomacy — Japan, the US, and South Korea held an emergency summit phone call immediately after the launch and issued a joint statement confirming the strengthening of their joint defense posture.
• Defense — The Japanese government announced its policy to accelerate the additional deployment of Aegis System-equipped vessels and the early operationalization of counterattack capabilities.
• Politics — Public opinion in Japan is divided over the increase in defense spending, with opposition parties strongly opposing the additional defense budget allocated in the supplementary budget for fiscal year 2026.
• Diplomacy — South Korea's Yoon Suk-yeol administration is promoting Japan-US-ROK cooperation, but with the 2027 presidential election approaching, progressive forces are beginning to advocate a return to a policy of engagement with North Korea.
• Economy — Additional sanctions resolutions at the UN Security Council remain virtually impossible due to vetoes by China and Russia, and the effectiveness of existing sanctions is also declining.
• Technology — According to analysis by the US Department of Defense, North Korea's warhead re-entry technology is still incomplete but could reach operational deployment levels by the end of 2027.
• Intelligence — North Korea is deepening military-technical cooperation with Russia, with information suggesting it is receiving technology transfers related to ballistic missiles and reconnaissance satellites in exchange for deploying troops to the Ukraine war.
• Economy — Japan's defense budget for fiscal year 2026 reached approximately 2% of GDP, effectively doubling since 2012. The framework of the defense buildup plan formulated during the Kishida administration has been inherited by the current administration.
• Society — An NHK public opinion poll (February 2026) showed that 52% "support" strengthening defense capabilities and 38% "oppose," a close margin, with opposition being the majority among younger generations (18-29 years old).
• Diplomacy — The Chinese Ministry of Foreign Affairs expressed "regret" over North Korea's missile launch but also issued a statement condemning the strengthening of military cooperation among Japan, the US, and South Korea as "actions that heighten regional tensions."

North Korea's missile development is a mirror reflecting the structural flaws of the post-Cold War East Asian security order. To understand the root of this problem, one must go back to the 1953 Korean War Armistice Agreement. The armistice was a "ceasefire," not an "end of war," meaning the Korean Peninsula has legally been in a state of war for 73 years. This unresolved structure has formed the fundamental motivation for North Korea's nuclear and missile development.

During the Cold War, North Korea secured its safety under the nuclear umbrellas of the Soviet Union and China. However, with the collapse of the Soviet Union in 1991, this security framework disintegrated. North Korea declared its withdrawal from the NPT (Treaty on the Non-Proliferation of Nuclear Weapons) in 1993 and shifted its course towards building its own nuclear deterrent. Diplomatic solutions were attempted, such as the 1994 Agreed Framework between the US and North Korea and the Six-Party Talks from 2003, but all ultimately failed. Since its first nuclear test in 2006, North Korea has irreversibly embarked on the path to becoming a nuclear-weapon state.

From a missile technology perspective, North Korea's development has been gradual but steady. The 2017 Hwasong-15 ICBM launch suggested its capability to reach the US mainland, and the 2022 Hwasong-17 boasted a range of over 15,000 kilometers. Since 2023, North Korea has focused on developing solid-fuel missiles, repeatedly conducting test launches of the Hwasong-18. The transition to solid fuel is militarily extremely significant. Liquid-fuel missiles require several hours for fuel injection before launch, making them vulnerable to detection and pre-emptive strikes by satellite reconnaissance during that time. Solid-fuel types can be launched in tens of minutes, dramatically increasing the reliability of deterrence.

There are three main reasons why the new missile test in early 2026 is particularly important. First, it demonstrates the maturity of solid-fuel technology. Second, it is possible that the results of military-technical cooperation with Russia are reflected. Since Russia's invasion of Ukraine in 2022, there is analysis that North Korea has acquired precision guidance technology for ballistic missiles and heat-resistant technology for re-entry vehicles in exchange for providing artillery shells and soldiers to Russia. Third, there is the political situation in the United States. The second Trump administration, which took office in January 2025, has pursued top-down summit diplomacy in its North Korea policy, but more than a year has passed without concrete progress.

In the context of Japan-US-ROK cooperation, the Camp David agreement in August 2023 was a historic turning point. Japan-South Korea relations had long been strained by historical issues, but the growing threat from North Korea and the rise of China, a common security environment, brought the two countries closer. However, the sustainability of this cooperation faces structural challenges. In South Korea, a "pendulum phenomenon" has repeatedly occurred, where North Korea policy swings widely with each presidential election. The shifts from Kim Dae-jung and Roh Moo-hyun's Sunshine Policy to Lee Myung-bak and Park Geun-hye's pressure policy, and then from Moon Jae-in's engagement policy to Yoon Suk-yeol's hardline policy, significantly undermine predictability for allied nations.

Japan's security policy has also transformed, with North Korea's missile threat serving as a major catalyst. The 1998 Taepodong launch triggered Japan's introduction of missile defense, and the series of launches in 2017 contributed to the justification of security legislation. The explicit inclusion of "counterattack capabilities" in the revision of the three security documents in 2022 signified a historic shift from Japan's post-war exclusively defensive policy. The new missile test in 2026 is creating a political environment that justifies the early operationalization of these counterattack capabilities and further increases in defense spending.

However, what must not be overlooked here is the aspect where North Korea's threat functions as a "convenient external pressure." The rebuilding of Japan's defense industry, the expansion of the Self-Defense Forces' capabilities, and the deepening of the Japan-US alliance—all of these were measures that would have been necessary to respond to China's rise even without the threat from North Korea. North Korea's missile launches are acting as a catalyst to reduce domestic political resistance to these measures.

The delta: North Korea's successful launch of a new solid-fuel ICBM qualitatively changed the deterrence balance in East Asia. The transition from liquid to solid fuel means a dramatic reduction in launch preparation time, making pre-emptive neutralization difficult. This forces Japan, the US, and South Korea to shift paradigms from passive missile defense to active "integrated deterrence." At the same time, a new variable, Russia-North Korea military-technical cooperation, has been added, fundamentally questioning the effectiveness of the post-Cold War nuclear non-proliferation regime.