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China has sent its coast guard into the maritime area of the Diaoyu islands and unmanned aerial vehicles near outlying Japanese territory as Beijing ramps up strains over the Japan's leader's comments regarding Taiwan.

Patrol Operations

On Sunday, the Chinese coast guard stated that its ships conducted a “lawful patrol operation” through the territorial seas of the Diaoyu islands, which are under the control of Tokyo but also asserted as territory by Beijing.

“China coast guard vessel 1307 formation performed surveillance within the territorial waters of the Senkaku islands. This was a lawful patrol operation conducted by the Chinese maritime authorities to protect its sovereign claims,” the statement said.

Bilateral Tensions

China and Japan have consistently clashed around the islands but the latest activity come amid an escalating political dispute after the Japan's leader, the Japanese official, told parliament that if China attack democratically ruled Taiwan it might provoke a military response from Japan.

That sparked an angry response from China, which has signalled it expects a retraction from Takaichi.

Taiwan's Position

Beijing asserts the island as its sovereign land and intends to annex it under what it terms “unification”. It has left open the use of force. Taiwan’s government and citizens overwhelmingly reject the prospect of Chinese rule – preferring to maintain the status quo without explicitly declaring themselves independent, but pledging to protect their sovereignty if required.

An military assault by China would threaten to spiral into a regional or global conflict, possibly drawing in the United States and other allies including Tokyo, which has territory just 110km (68 miles) from Taiwan.

Military Activity

In Taiwan, the defence ministry said on Sunday morning that it had detected three dozen PLA planes, seven navy ships and one “official” ship, which was likely the coast guard, operating around the island over the past 24 hours.

Maps provided by the ministry showed up to three drones flying between Taiwan and the Japanese islands off its north-east coast, seeming to travel unusually near to Yonaguni. Chinese military transits there are not rare, but uncommon, and Chinese military activity in the island's ADIZ generally has been minimal in recent weeks.

Late on Saturday, the ministry said Beijing had been carrying out another “combined military exercise” to “test our defensive capabilities”. It added the island had sent its own aircraft and ships to track the developments. Taiwan documents these operations a couple of times a month as part of what Taipei says is an continuous strategic pressure.

Political Strain

Tokyo has been facing mounting pressure from China since the Japanese official made her remarks, with Beijing's diplomatic representative in the Japanese city triggering an official complaint from Tokyo by commenting that “the dirty head that sticks itself out must be cut off”.

China then summoned the Japanese ambassador for the first occasion since 2023, and Beijing's military authorities stated that any Tokyo's involvement would be certain to collapse.

Travel and Education Advisory

Late last week, China cautioned its citizens against travelling to Japan, leading Japan to request China to take “appropriate measures”, though it did not elaborate.

Three Chinese airlines announced this weekend that flights to Tokyo could be refunded or changed for free.

In another escalation, China’s government on the weekend advised students to rethink education plans in Japan, citing what it described as an volatile safety situation.

While the advice does not amount to a ban, a significant decrease in the population of learners from China could have a negative impact on Japanese universities. A historic high of over 336,000 international students were enrolled in Japanese schools last year, according to official data. They featured over 123,000 learners from China – by far the largest demographic.

Official Commentary

Late on Saturday, a official press commentary accused Takaichi of staging a diplomatic maneuver that was “both reckless and fundamentally flawed”.

“A conflict between Japan and China would not be a small-scale encounter; it would probably involve other powers, including the United States, and could rapidly escalate to a large-scale conflict with severe repercussions.”

Strategic Positions

The administration in Taipei says the island's residents alone determine their destiny. Japanese leaders have previously avoided publicly mentioning Taiwan when discussing such scenarios, maintaining a “deliberate vagueness” also preferred by Tokyo’s main security ally, the US.

Nevertheless, China’s ruling Communist party says the incorporation of the island with the mainland China is “unavoidable”, and casts any opposition to it as escalatory. As it advances toward potential armed takeover, China has also been increasing its political operations and its rhetoric towards the island.