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China has deployed its maritime law enforcement through the waters of the Diaoyu islands and military drones past remote Japanese territory as Beijing ramps up strains following the Japanese prime minister’s remarks regarding Taiwan.

Patrol Operations

On Sunday, the China's maritime patrol announced that its ships carried out a “lawful patrol operation” through the territorial seas of the Diaoyu islands, which are administered by Japan but also asserted as territory by Beijing.

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

Diplomatic Spat

China and Japan have repeatedly faced off around the disputed territory 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 could trigger a armed reaction from Tokyo.

That sparked an angry response from China, which has indicated it demands a withdrawal from the Japanese official.

Taiwan's Position

Beijing asserts Taiwan as its sovereign land and intends to annex it under what it describes as “unification”. It has left open the use of force. Taiwan’s government and citizens overwhelmingly reject the idea of Beijing's control – preferring to maintain the status quo without formally announcing independence, but pledging to protect their sovereignty if required.

An military assault by China would risk escalating into a regional or global conflict, potentially involving the US and other allies including Japan, which has land just 110km (68 miles) from Taiwan.

Defense Operations

In Taiwan, the military authorities reported this weekend that it had detected three dozen PLA planes, multiple naval vessels and one government vessel, which was likely the coast guard, active near the territory over the previous day.

Maps provided by the ministry showed up to multiple UAVs operating near the island and the Japan's territory off its north-east coast, seeming to travel particularly close to Yonaguni. Chinese military transits there are not rare, but uncommon, and Chinese military activity in Taiwan’s air defence identification zone generally has been minimal in the past month.

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

Diplomatic Pressure

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

Beijing then summoned the Japanese ambassador for the first time in more than two years, and China’s defence ministry declared that any Japanese intervention would be doomed to fail.

Travel and Education Advisory

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

Three Chinese airlines said on Saturday that tickets to Japan 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 characterized as an unstable security environment.

Although not an outright prohibition, a dramatic reduction in the population of learners from China could have a detrimental effect on academic institutions in Japan. 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 political stunt that was “not just dangerously provocative but fundamentally perverse”.

“A clash between Tokyo and Beijing would not be a limited skirmish; it would probably involve other powers, including the United States, and could rapidly escalate to a major confrontation with severe repercussions.”

Strategic Positions

The government of Taiwan says only its people can decide its future. Officials in Tokyo have traditionally refrained from publicly mentioning Taiwan when discussing such scenarios, maintaining a “strategic ambiguity” also favoured by Japan's primary defense partner, the US.

However, China’s ruling Communist party says the incorporation of the island with the People’s Republic of China is “unavoidable”, 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 rhetoric towards Taiwan.