For years, the rivalry between China and Japan was treated as a recurring diplomatic irritant. Historical grievances stemming from Japan’s invasion of China in the early 20th century have always created animosity in relations. Despite the general sense of bitterness and frequent tensions over the disputed islands, China and Japan have managed to maintain deep and closely-knit economic relations.
But the latest escalation is different. This hinges on a broader strategic question of whether Japan remains a restrained postwar power or becomes a more powerful military player in the balance of power against China. Tokyo appears to have chosen the latter path, and Beijing is not happy.
The most immediate trigger was Prime Minister Takaichi Sanae’s statement in November 2025 that a Chinese attack on Taiwan could constitute a “situation threatening the survival” of Japan. This specific phrase is legal language that could allow the deployment of Japanese Self-Defense Forces. China asked Takaichi to retract his comments, arguing they violated the political basis of the 1972 Sino-Japanese Joint Declaration, which set the framework for diplomatic normalization. Takaichi refused to back down. The result was one of the sharpest deteriorations in their ties in recent years.
A number of recent developments have made the situation worse. In March 2026, Japan deployed its first upgraded Type 12 surface-to-ship missiles, with a range of approximately 1,000 kilometers, give this is a standoff capability that could reach mainland China. Beijing is particularly concerned about Japan’s plans to deploy missiles on Yonagunithe westernmost island of Japan, about 110 km from Taiwan.
The passage of the Japanese destroyer JS Ikazuchi through the Taiwan Strait on April 17 aggravated Beijing. This date marks the anniversary of the treaty by which Taiwan was ceded to Japan, symbolizing a humiliating memory for Beijing. In response, China’s Foreign Ministry, Defense Ministry and Eastern Theater Command all condemned the move. Beijing also launched combat readiness patrols in the East China Sea and sent warships near Okinawa after transit.
Whether or not Tokyo intended the symbolism of April 17 is almost irrelevant. In times of crisis, intention often matters less than interpretation. Beijing now views these actions from a cumulative perspective. For Japan, such transits signal support for freedom of navigation and opposition to unilateral control of the Taiwan Strait. In China’s eyes, Japan is becoming a more active military player in the First Island Chain.
Shortly after this incident, Takaichi sent a ritual offerings at the Yasukuni Shrine, while other Japanese officials visited the shrine. China condemned the offerings and visits, calling them proof that Japan had not fully reckoned with its imperial past.
This is not new. Yasukuni has long been a source of anger in China and South Korea because it honors Japan’s war dead, including convicted Class A war criminals. What is new is the context. Under a leader already associated with a harder line on history and security, the offering of shrine is no longer seen as simply a signal to the Japanese prime minister’s domestic conservative base. Beijing has integrated the Yasukuni offer into a broader narrative of Japanese “neomilitarism.”
For China, this narrative has been reinforced by Japan’s defense reforms. In April, Japan announcement It is the biggest overhaul of arms export rules in decades, removing restrictions that largely limited finished defense exports to five non-combat categories: rescue, transportation, warning, surveillance and mine clearance. This change paves the way for exports of lethal weapons – warships, missiles and other weapons – subject to controls. China immediately expressed concern, viewing the move as another step forward from Japan’s pacifist restrictions.
Takaichi also recently spear a 15-member expert group tasked with reassessing the country’s security and defense policies, including emergency scenarios and budgetary priorities. Japan has already met its goal of doubling its defense spending to 2% of GDP under the 2022 plan, and the panel could consider further increases.
Japan’s new diplomatic language has also degraded China’s position. The 2026 Diplomatic Blue Book downgraded China from “one of the most important bilateral relations” to an “important neighboring country”. Additionally, the March 2026 intrusion of the Chinese embassy in Tokyo by a knife-wielding Japanese Self-Defense Forces officer added another layer of distrust. Japan called the incident regrettable and increased security, but China demanded tough sanctions and argued that Tokyo’s response was insufficient.
The nuclear debate has further sharpened Chinese suspicions. Takaichi has not announced any decision to acquire nuclear weapons or seek to deploy U.S. nuclear weapons on Japanese soil. Japan still formally adheres to its three non-nuclear principles: not possessing, not producing, and not allowing the introduction of nuclear weapons. Yet Takaichi’s previously expressed ambiguity over whether these principles would remain unchanged in future security documents opened a politically sensitive debate, particularly over the third principle.
On April 30, Beijing released a working paper warning on Japan’s “nuclear ambitions”. At the same time, he raised the alarm over Japan’s nuclear potential at the United Nations NPT Review Conference in New York, pledging to prevent Tokyo from acquiring or harboring nuclear weapons. This is important because China is trying to internationalize the issue. This places the Japanese nuclear debate ahead of the broader nonproliferation community, even though Japan remains under IAEA safeguards and is a non-nuclear weapon state under the terms of the NPT.
Japan has a possible interest in nuclear power – not nuclear power.armed – submarines, supplied by the United States. This is not exactly reassuring for Beijing, as it would give Japan greater endurance, greater submarine range, and greater operational relevance in the Western Pacific.
Neither China nor Japan want war. The danger is that each side increasingly believes that the other is preparing for one of these events. This increases the risk of crisis escalation, as China and Japan now evaluate their respective actions through worst-case assumptions.
For the United States, Japan’s tougher security posture is largely helpful. Washington has long wanted Japan to become a more capable military ally.
For India, the implications are both promising and sobering. A stronger Japan is strategically useful. It spreads China’s attention across multiple theaters and opens new opportunities for cooperation in defense, industry and economic security.
But India does not benefit from an uncontrolled escalation between Japan and China. A crisis between them would disrupt supply chains, shipping routes, technology flows and regional trust. India’s best approach, therefore, is to maintain balance in a disciplined manner. It is expected to deepen cooperation with Japan in maritime domain awareness, underwater surveillance, critical minerals and coast guard capacity. But it must remain cautious in the face of a resurgence of historical nationalism and nuclear ambiguity.