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Beijing has deployed its maritime law enforcement into the maritime area of the Diaoyu islands and unmanned aerial vehicles near outlying Japanese territory as Beijing ramps up tensions over the Japan's leader's remarks regarding Taiwan.

Patrol Operations

On Sunday, the Chinese coast guard announced that its vessels carried out a “rights enforcement patrol” through the territorial seas of the Diaoyu islands, which are under the control of Japan but also asserted as territory by China.

“Chinese maritime patrol unit 1307 conducted patrols within the maritime jurisdiction of the Senkaku islands. This was a legitimate rights enforcement activity undertaken by the Chinese maritime authorities to uphold its rights and interests,” the statement said.

Bilateral Tensions

Beijing and Tokyo have consistently clashed around the disputed territory but the recent developments come amid an intensifying diplomatic spat after the Japan's leader, Sanae Takaichi, addressed lawmakers that if Beijing assaults democratically ruled Taiwan it could trigger a military response from Japan.

That sparked an angry response from China, which has indicated it demands a retraction from Takaichi.

Island's Stance

Beijing asserts Taiwan as its own territory and plans to incorporate it under what it terms “reunification”. It has not ruled out the military option. Taiwan’s government and people categorically refuse the prospect of Chinese rule – preferring to maintain the current situation without explicitly declaring themselves independent, but vowing to defend themselves if necessary.

An military assault by China would risk escalating into a regional or global conflict, possibly drawing in the US and other allies including Japan, which has territory just 110km (68 miles) from the island.

Military Activity

On the island, the defence ministry reported this weekend that it had observed 30 Chinese military aircraft, seven navy ships and one “official” ship, which was probably the maritime patrol, active near the territory over the past 24 hours.

Maps provided by the ministry showed up to multiple UAVs flying between the island and the Japanese islands off its northeastern shoreline, seeming to travel particularly close to the nearby Japanese island. Chinese military transits there are not rare, but infrequent, and Beijing's defense operations in the island's ADIZ generally has been minimal in the past month.

Earlier this weekend, the defense officials said Beijing had been carrying out another “combined military exercise” to “harass the airspace and sea around us”. It noted Taiwan had dispatched military assets to monitor the situation. Taiwan documents these operations a few times monthly as part of what Taipei says is an continuous strategic pressure.

Diplomatic Pressure

Tokyo has been facing mounting pressure from China since Takaichi made her comments, with China’s consul general in Osaka triggering an official complaint from Japan by commenting that “the dirty head that sticks itself out must be cut off”.

Beijing then called in Japan's diplomat for the first occasion since 2023, and China’s defence ministry stated that any Japanese intervention would be doomed to fail.

Warning for Citizens

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

Three Chinese airlines said on Saturday that tickets to Japan could be cancelled without penalty.

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 significant decrease in the population of learners from China could have a negative impact on academic institutions in Japan. A record 336,708 foreign nationals were enrolled in Japanese schools last year, according to official data. They featured over 123,000 learners from China – by far the single biggest group.

Official Commentary

Earlier this weekend, a official press commentary accused Takaichi of staging a political stunt that was “both reckless and fundamentally flawed”.

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

Policy Standpoints

The administration in Taipei says the island's residents alone determine their destiny. Japanese leaders have previously avoided publicly mentioning Taiwan when addressing potential conflicts, maintaining a “strategic ambiguity” also preferred by Japan's primary defense partner, the United States.

However, Beijing's governing party says the incorporation of the island with the People’s Republic of China is “inevitable”, and portrays dissent as provocative. As it moves towards being capable of military annexation, China has also been escalating its non-military activity and its statements towards the island.