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China has sent its maritime law enforcement into the waters of the Diaoyu islands and military drones past remote Japanese territory as China escalates strains over the Japan's leader's remarks regarding the island of Taiwan.

Patrol Operations

On Sunday, the Chinese coast guard stated that its ships conducted a “rights enforcement patrol” through the waters of the Senkaku, which are under the control of Tokyo but also claimed by China.

“China coast guard vessel 1307 formation performed surveillance within the maritime jurisdiction of the Senkaku islands. This was a lawful patrol operation conducted by the Chinese maritime authorities to protect its sovereign claims,” the statement said.

Diplomatic Spat

Beijing and Tokyo have repeatedly faced off around the islands but the recent developments come amid an escalating political dispute after the Japanese prime minister, Sanae Takaichi, told parliament that if Beijing assaults the self-governing island of Taiwan it could trigger a armed reaction from Japan.

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

Taiwan's Position

Beijing asserts Taiwan as its own territory and plans to incorporate it under what it terms “reunification”. It has left open the use of force. The island's administration and citizens categorically refuse the idea of Beijing's control – preferring to maintain the status quo without explicitly declaring themselves independent, but vowing to defend themselves if required.

An military assault by Beijing would threaten to spiral into a international confrontation, potentially involving the US and other partner nations including Tokyo, which has territory just 68 miles from Taiwan.

Military Activity

In Taiwan, 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 previous day.

Maps provided by the ministry showed up to multiple UAVs flying between Taiwan and the Japan's territory off its north-east coast, appearing to go unusually near to the nearby Japanese island. Chinese military transits there are occasional, but uncommon, and Chinese military activity 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 “test our defensive capabilities”. It noted Taiwan had dispatched military assets to track the developments. The island documents these operations a couple of times a month as part of what Taipei says is an continuous strategic pressure.

Political Strain

Tokyo has been experiencing increased strain from China since Takaichi made her remarks, with Beijing's diplomatic representative in Osaka triggering an official complaint from Tokyo by commenting that “those who interfere will face consequences”.

Beijing then summoned the Japanese ambassador for the first occasion since 2023, and China’s defence ministry stated that any Tokyo's involvement would be certain to collapse.

Travel and Education Advisory

On Friday, China advised its people to avoid visiting Japan, prompting Tokyo to urge Beijing to take “appropriate measures”, though it provided no details.

Multiple carriers from China announced this weekend that flights to Tokyo 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 described as an unstable security environment.

Although not an outright prohibition, 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 studying in Japan last year, according to official data. They included more than 123,000 Chinese students – by far the single biggest group.

Official Commentary

Earlier this weekend, a Chinese state media editorial 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 quickly spiral into a major confrontation with severe repercussions.”

Policy Standpoints

The government of Taiwan says the island's residents alone determine their destiny. Japanese leaders have previously avoided publicly mentioning Taiwan when discussing such scenarios, maintaining a “deliberate vagueness” also favoured by Tokyo’s main security ally, the US.

Nevertheless, China’s ruling Communist party says the unification of Taiwan with the mainland China is “inevitable”, and casts any opposition to it as escalatory. As it moves towards being capable of military annexation, Beijing has also been escalating its non-military activity and its rhetoric towards the island.