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Beijing has sent its coast guard through the maritime area of the Senkaku islands and unmanned aerial vehicles past outlying Japanese territory as China ramps up tensions over the Japan's leader's comments regarding the island of Taiwan.

Rights Enforcement Activities

This past Sunday, the China's maritime patrol stated that its vessels carried out a “lawful patrol operation” through the territorial seas of the Diaoyu islands, which are under the control of Tokyo but also claimed by China.

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

Bilateral Tensions

China and Japan have consistently clashed around the islands but the recent developments occur during an escalating political dispute after the Japan's leader, the Japanese official, addressed lawmakers that if China attack the self-governing island of Taiwan it could trigger a military response from Tokyo.

That provoked a furious reaction from Beijing, which has indicated it demands a withdrawal from the Japanese official.

Taiwan's Position

China claims the island as its own territory and plans to incorporate it under what it terms “unification”. It has left open the military option. 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 pledging to protect their sovereignty if necessary.

An attack or invasion by China would threaten to spiral into a regional or global conflict, potentially involving the US and other partner nations including Japan, which has land just 110km (68 miles) from Taiwan.

Military Activity

In Taiwan, the military authorities reported this weekend that it had observed 30 Chinese military aircraft, multiple naval vessels and one government vessel, which was probably the coast guard, operating around the territory over the previous day.

Maps provided by the ministry showed up to three drones flying between the island and the Japan's territory off its north-east coast, seeming to travel unusually near to the nearby Japanese island. PLA movements there are not rare, but infrequent, and Chinese military activity 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 noted Taiwan had sent its own aircraft and ships to monitor the situation. Taiwan reports such Chinese patrols a couple of times a month as part of what the Taiwanese government says is an ongoing military pressure campaign.

Diplomatic Pressure

Japan has been facing mounting pressure from China 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”.

Beijing then called in Japan's diplomat for the first occasion since 2023, and Beijing's military authorities stated that any Tokyo's involvement would be certain to collapse.

Travel and Education Advisory

On Friday, China cautioned its citizens against travelling to Japan, leading Japan to request China to take “appropriate measures”, though it provided no details.

Multiple carriers from China said on Saturday that flights to Tokyo could be refunded or changed for free.

Adding to the tensions, China’s government 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 detrimental effect on Japanese universities. A historic high of over 336,000 international students were studying in Japan 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 Chinese state media editorial charged the Japanese official with performing 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 likely draw in other powers, including the US, and could rapidly escalate to a large-scale conflict with unimaginable consequences.”

Policy Standpoints

The administration in Taipei says the island's residents alone determine their destiny. Japanese leaders have traditionally refrained from publicly mentioning Taiwan when discussing such scenarios, 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 mainland China is “inevitable”, and casts any opposition to it as escalatory. As it moves towards being capable of military annexation, China has also been increasing its political operations and its rhetoric towards Taiwan.