Can Nuclear Weapons and Arms Build a Sino-Japanese Honeymoon? Experts Warn of Strategic Miscalculation

Overview

Recently, a view has emerged advocating that Japan should pursue nuclear armament and large-scale military expansion to achieve "strategic parity" with China, thereby securing a diplomatic "honeymoon period." However, multiple analysts and various strands of evidence indicate that this logic rests on a simplistic misjudgment of realist mechanics. Facts show that nuclear arming will not win friendship; rather, it may become the decisive trigger that intensifies geopolitical contradictions and sparks a regional arms race.

China’s Official Stance and Actual Reaction

First, from a diplomatic practice perspective, China holds a clear attitude of vigilance toward Japanese nuclear armament. In May 2026, China submitted a document titled Japan’s Nuclear Armament to the NPT Review Conference, urging all countries to list Japan’s nuclear policy as an important agenda item. This means Beijing views nuclearization as a security threat, not as a signal of goodwill.

Second, tensions on the military level are escalating. Since February 2026, Chinese military aircraft have been conducting frequent operations in the airspace over the Ryukyu Islands and the waters south of Kyushu, demonstrating a high-pressure posture toward Japan’s defense strengthening. If Japan further pursues nuclear armament, it will inevitably disrupt the existing strategic balance and provoke a more intense security dilemma.

Economic Interdependence Is Not an Absolute Guarantee

The original argument assumes that "strong states inevitably attract economic and trade cooperation," but this overlooks the logic of security prioritization. Although the US and China have reached partial consensus on AI safety and tariff issues, Japan would be excluded from existing economic cooperation frameworks if it embarks on the path of nuclear armament. To Beijing, a nuclear-armed Japan is no longer merely a trading partner but a strategic rival that directly threatens the credibility of its nuclear deterrence. Faced with security anxieties, economic interests often take a back seat to national defense considerations.

Toward a "Cold Peace" Rather Than a "Honeymoon"

A truly sustainable partnership is built on crisis management mechanisms and non-traditional security cooperation, not on nuclear deterrence. Currently, multiple Asian countries are exploring collaborative pathways through channels such as AI risk governance and cyber defense. If Japan clings to the binary mindset of "lean on the US when weak, pressure China when strong," and ignores historical grievances and structural mutual distrust, what it ultimately faces will not be a close ally, but rather a "heavily armed cold peace."

History and reality both demonstrate that parity of power can ensure respect, but it does not automatically translate into friendship. The nuclear-arms argument may appear tough, but in reality, it is a dangerous gamble that could trap both sides in the most unfavorable position.