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Beijing has sent its coast guard through the maritime area of the Diaoyu islands and military drones past outlying Japanese territory as China escalates strains over the Japanese prime minister’s comments regarding Taiwan.

Patrol Operations

On Sunday, the China's maritime patrol stated that its ships conducted a “rights enforcement patrol” through the territorial seas of the Senkaku, which are administered by Tokyo but also claimed by China.

“China coast guard vessel 1307 formation performed surveillance within the territorial waters of the Diaoyu islands. This was a legitimate rights enforcement activity conducted by the China coast guard to protect its sovereign claims,” the statement said.

Bilateral Tensions

China and Japan have consistently clashed around the disputed territory but the latest activity come amid an escalating political dispute after the Japan's leader, Sanae Takaichi, addressed lawmakers that if Beijing assaults the self-governing island of Taiwan it could trigger a armed reaction from Japan.

That provoked a furious reaction from Beijing, which has signalled it expects a withdrawal from Takaichi.

Island's Stance

China claims the island as its sovereign land and intends to annex it under what it terms “unification”. It has not ruled out the military option. Taiwan’s government and citizens overwhelmingly reject the prospect of Chinese rule – preferring to maintain the status quo without explicitly declaring themselves independent, but vowing to defend themselves if required.

An attack or invasion by China would risk escalating into a international confrontation, potentially involving the United States and other partner nations including Tokyo, which has territory just 110km (68 miles) from Taiwan.

Defense Operations

On the island, the defence ministry reported this weekend that it had detected 30 Chinese military aircraft, seven navy ships and one “official” ship, which was probably the coast guard, operating around the territory over the past 24 hours.

Maps provided by the ministry showed up to multiple UAVs flying between Taiwan and the Japan's territory off its north-east coast, seeming to travel unusually near to the nearby Japanese island. PLA movements there are not rare, but uncommon, and Beijing's defense operations in Taiwan’s air defence identification zone generally has been minimal in the past month.

Late on Saturday, the defense officials said China had been conducting another “combined military exercise” to “harass the airspace and sea around us”. It noted the island had dispatched military assets to monitor the situation. The island documents these operations a couple of times a month as part of what Taipei says is an continuous strategic pressure.

Diplomatic Pressure

Japan has been experiencing increased strain from China since Takaichi made her comments, with China’s consul general in Osaka prompting a formal protest from Tokyo by stating that “the dirty head that sticks itself out must be cut off”.

China then called in Japan's diplomat for the first occasion since 2023, and Beijing's military authorities declared that any Japanese intervention would be doomed to fail.

Warning for Citizens

Late last week, China cautioned its citizens against travelling to Japan, leading Japan to request China to take “suitable actions”, though it provided no details.

Multiple carriers from China announced this weekend that tickets to Japan could be refunded or changed for free.

In another escalation, Beijing's administration on the weekend advised students to rethink education plans in Japan, citing what it characterized as an unstable security environment.

While the advice does not amount to a ban, a dramatic reduction in the number of Chinese students could have a negative impact on Japanese universities. A record 336,708 foreign nationals were studying in Japan last year, according to official data. They included more than 123,000 Chinese students – by far the largest demographic.

Official Commentary

Earlier this weekend, a official press commentary accused Takaichi of staging a political stunt that was “not just dangerously provocative but fundamentally perverse”.

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

Policy Standpoints

The government of Taiwan says the island's residents alone determine their destiny. Japanese leaders have traditionally refrained from discussing the island openly when discussing such scenarios, maintaining a “deliberate vagueness” also preferred by Tokyo’s main security ally, the United States.

Nevertheless, Beijing's governing party says the unification of Taiwan with the People’s Republic of China is “inevitable”, and portrays dissent as provocative. As it advances toward potential armed takeover, Beijing has also been escalating its non-military activity and its statements towards the island.