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Beijing has sent its maritime law enforcement through the maritime area of the Diaoyu islands and unmanned aerial vehicles past outlying Japanese territory as China escalates 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 waters of the Senkaku, which are administered by Tokyo but also claimed by Beijing.

“Chinese maritime patrol unit 1307 conducted patrols within the maritime jurisdiction of the Diaoyu islands. This was a legitimate rights enforcement activity conducted by the Chinese maritime authorities to protect its sovereign claims,” the statement said.

Diplomatic Spat

Beijing and Tokyo have consistently clashed around the disputed territory but the recent developments come amid an escalating political dispute after the Japan's leader, Sanae Takaichi, told parliament that if Beijing assaults democratically ruled Taiwan it could trigger a military response from Japan.

That sparked an angry response from Beijing, which has signalled it expects a retraction from the Japanese official.

Island's Stance

China claims Taiwan as its own territory and plans to incorporate it under what it terms “unification”. It has left open the military option. Taiwan’s government and people overwhelmingly reject the idea of Beijing's control – preferring to maintain the current situation without formally announcing independence, but vowing to defend themselves if necessary.

An attack or invasion by Beijing would threaten to spiral into a international confrontation, possibly drawing in the United States and other allies including Japan, which has land just 110km (68 miles) from the island.

Defense Operations

On the island, the defence ministry reported this weekend that it had detected three dozen PLA planes, seven navy ships and one “official” ship, which was probably the coast guard, operating around the island over the past 24 hours.

Maps provided by the ministry showed up to multiple UAVs operating near Taiwan and the Japanese islands off its northeastern shoreline, seeming to travel unusually near to Yonaguni. Chinese military transits there are occasional, but infrequent, and Beijing's defense operations in the island's ADIZ generally has been minimal in the past month.

Earlier this weekend, the ministry said China had been carrying out another “joint combat patrol” to “test our defensive capabilities”. It noted the island had sent its own aircraft and ships to monitor the situation. Taiwan reports such Chinese patrols a few times monthly as part of what Taipei says is an continuous strategic pressure.

Political Strain

Tokyo has been facing mounting pressure from Beijing since the Japanese official made her remarks, with Beijing's diplomatic representative in the Japanese city triggering an official complaint from Tokyo by stating that “those who interfere will face consequences”.

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

Warning for Citizens

On Friday, Beijing advised its people to avoid visiting Japan, prompting Tokyo to urge Beijing to take “appropriate measures”, though it did not elaborate.

Multiple carriers from China said on Saturday that tickets to Japan could be cancelled without penalty.

Adding to the tensions, Beijing's administration on Sunday advised students to rethink education plans in Japan, citing what it characterized 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 detrimental effect on academic institutions in Japan. A record 336,708 foreign nationals were enrolled in Japanese schools last year, according to official data. They included more than 123,000 Chinese students – by far the largest demographic.

Media Response

Earlier this weekend, a Chinese state media editorial accused Takaichi of staging a political stunt 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 government of Taiwan says only its people can decide its future. Officials in Tokyo have previously avoided discussing the island openly when addressing potential conflicts, maintaining a “strategic ambiguity” also preferred by Japan's primary defense partner, the US.

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, China has also been escalating its non-military activity and its statements towards the island.