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Beijing has deployed its maritime law enforcement into the maritime area of the Diaoyu islands and unmanned aerial vehicles past remote Japanese territory as China ramps up strains following the Japan's leader's remarks regarding Taiwan.

Patrol Operations

On Sunday, the Chinese coast guard stated that its ships conducted a “rights enforcement patrol” through the territorial seas of the Diaoyu islands, which are administered by Japan 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.

Diplomatic Spat

China and Japan have repeatedly faced off around the islands but the latest activity come amid an escalating political dispute after the Japanese prime minister, Sanae Takaichi, addressed lawmakers that if Beijing assaults the self-governing island of Taiwan it might provoke a military response from Tokyo.

That provoked a furious reaction from Beijing, which has indicated it demands a withdrawal from Takaichi.

Island's Stance

Beijing asserts Taiwan as its sovereign land and intends to annex it under what it terms “reunification”. It has left open the military option. The island's administration and people overwhelmingly reject the prospect of Chinese rule – choosing to preserve the status quo without formally announcing independence, but pledging to protect their sovereignty if necessary.

An attack or invasion by Beijing would threaten to spiral into a international confrontation, potentially involving the US and other allies including Tokyo, which has territory just 68 miles from the island.

Military Activity

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 likely the maritime patrol, operating around the island over the previous day.

Maps provided by the ministry showed up to multiple UAVs operating near the island and the Japanese islands off its northeastern shoreline, appearing to go unusually near to Yonaguni. PLA movements there are occasional, but infrequent, and Beijing's defense operations in the island's ADIZ generally has been low 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 added the island had sent its own aircraft and ships to track the developments. The island documents these operations a couple of times a month as part of what Taipei says is an ongoing military pressure campaign.

Diplomatic Pressure

Japan has been facing mounting pressure from Beijing since the Japanese official made her comments, with Beijing's diplomatic representative in Osaka prompting a formal protest from Tokyo by commenting that “those who interfere will face consequences”.

China then summoned the Japanese ambassador for the first time in more than two years, and China’s defence ministry declared that any Tokyo's involvement would be certain to collapse.

Warning for Citizens

On Friday, Beijing cautioned its citizens against travelling to Japan, leading Japan to request China to take “appropriate measures”, though it did not elaborate.

Multiple carriers from China said on Saturday that flights to Tokyo could be cancelled without penalty.

In another escalation, Beijing's administration on Sunday urged its citizens to “carefully reconsider” studying in Japan, citing what it described 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 detrimental effect on Japanese universities. A record 336,708 foreign nationals were studying in Japan last year, according to education statistics. 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 political stunt that was “not just dangerously provocative but fundamentally perverse”.

“A clash between Tokyo and Beijing would not be a small-scale encounter; it would likely draw in other powers, including the US, and could quickly spiral into a large-scale conflict with severe repercussions.”

Policy Standpoints

The administration in Taipei says the island's residents alone determine their destiny. Officials in Tokyo have traditionally refrained from discussing the island openly when addressing potential conflicts, maintaining a “strategic ambiguity” also preferred by Japan's primary defense partner, the United States.

Nevertheless, Beijing's governing party says the unification of Taiwan with the mainland China is “unavoidable”, and portrays dissent as provocative. As it moves towards being capable of military annexation, China has also been increasing its political operations and its rhetoric towards the island.