Beijing vs. Tokyo: The Dispute Over 'Defense of Japan 2026'

China has rejected Japan's newly released defense white paper as a "false narrative" intended to justify a military buildup, in a pointed exchange between the two governments. Chen Xi, a spokesperson for China's Ministry of National Defense, said Tuesday that "Defense of Japan 2026" is a classic case of "a thief crying 'stop thief'" and expressed China's "strong dissatisfaction and firm opposition" to the document.

The white paper describes China's military activities as Japan's "greatest strategic challenge ever" and criticizes Chinese operations around the Taiwan region, against what Tokyo portrays as an increasingly severe regional security environment. Chen dismissed that framing, accusing Japan's ruling authorities of accelerating the revision of the country's three key security documents, steadily raising defense spending, expanding long-range strike capabilities, and attempting to embed military expansion into Japan's institutions, industry and public opinion.

Chen described what he called Japan's "new militarism" as a serious challenge to the postwar international order and "the real threat to regional peace and stability." He reiterated that the Taiwan question concerns China's sovereignty and territorial integrity and matters to the political foundation of China-Japan relations, and urged Tokyo to reflect on its history of aggression, stop interfering in China's internal affairs and avoid "going further down the wrong path of remilitarization."

What's Actually Behind Japan's 'Greatest Strategic Challenge' White Paper

Japan's Buildup Is What China Is Really Responding To

Behind the rhetoric is a measurable shift in Japanese policy. Tokyo revised its three key security documents — the National Security Strategy, the National Defense Program Guidelines and the Medium-Term Defense Program — in late 2022, committing to roughly double defense spending to about 2 percent of GDP by fiscal 2027 and to field long-range strike capabilities Japan had long avoided. The white paper's unusually strong language on China is consistent with that trajectory: the more Tokyo frames Beijing as a threat, the easier it is to sustain higher defense budgets at home. That is precisely the mechanism Beijing says it is objecting to.

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Both Sides Are Escalating the Framing

"Greatest strategic challenge ever" is among the starkest descriptions of China in a Japanese defense paper, and Beijing's answer — invoking "militarism," a term loaded with wartime history across East Asia — matches it in intensity. The exchange is less a factual dispute over specific military activities than a contest over which government wins the framing of the other as an aggressor. Each side's domestic audience is a real factor: threat narratives are politically useful in both Tokyo and Beijing, which argues that the tone will harden before it softens.

Taiwan Is the Point Where Words Can Become Action

The most concrete issue in the dispute is Taiwan. Japan's recent security documents have increasingly referenced the stability of the island, and the white paper explicitly criticizes Chinese military activity there. Beijing treats the issue as non-negotiable and as the political foundation of bilateral ties. This is the area where rhetorical clashes are most likely to develop into operational friction — patrols, exercises or incidents in and around the Taiwan Strait — because neither government can afford to appear to back down on it.

Reading the Fallout: What to Track as the China-Japan Dispute Evolves

The immediate consequence of this exchange is a harder tone in the region's most important bilateral security relationship, with no clear de-escalation mechanism on the horizon. For companies, investors and analysts with exposure to the two economies, the practical question is how the security competition shows up in measurable terms.

  • Track Japan's defense budget as the concrete indicator: under the 2022 security documents, spending is set to roughly double to about 2 percent of GDP by fiscal 2027, with the current Medium-Term Defense Program running through that year. Each annual budget vote shows whether the buildup holds — a result Beijing is certain to cite as proof of "remilitarization."
  • For businesses with supply chains spanning China and Japan: past disputes between the two governments have at times moved from security rhetoric into trade and technology measures. The current clash is still confined to statements; when economic measures have come in earlier episodes, they followed the security confrontation rather than preceded it.
  • For shippers and logistics operators: in past Taiwan Strait crises, war-risk insurance premiums spiked and some carriers rerouted vessels. Any incident during this standoff would hit the same mechanisms — the fastest route from a political dispute to real-world costs.
  • Watch the next revision of Japan's security documents: whether the "greatest strategic challenge" formulation is carried into formal policy will show if this white paper was a one-off or a new baseline in Tokyo's posture toward China.