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China has sent its coast guard through the maritime area of the Diaoyu islands and unmanned aerial vehicles past remote Japan's territory as Beijing escalates tensions following the Japanese prime minister’s comments regarding Taiwan.

Patrol Operations

On Sunday, the China's maritime patrol announced that its ships conducted a “lawful patrol operation” through the territorial seas of the Diaoyu islands, which are administered by Tokyo but also claimed by China.

“Chinese maritime patrol unit 1307 performed surveillance within the maritime jurisdiction of the Diaoyu islands. This was a lawful patrol operation undertaken by the Chinese maritime authorities to uphold its rights and interests,” the statement said.

Bilateral Tensions

Beijing and Tokyo have consistently clashed around the disputed territory but the recent developments occur during an escalating political dispute after the Japanese prime minister, Sanae Takaichi, told parliament that if China attack the self-governing island of Taiwan it could trigger a armed reaction from Japan.

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

Island's Stance

China claims Taiwan as its own territory and plans to incorporate it under what it describes as “unification”. It has not ruled out the military option. Taiwan’s government and citizens categorically refuse the idea of Beijing's control – choosing to preserve the current situation without explicitly declaring themselves independent, but vowing to defend themselves if required.

An military assault by Beijing would risk escalating into a regional or global conflict, possibly drawing in the US and other allies including Japan, which has territory just 110km (68 miles) from Taiwan.

Military Activity

In Taiwan, the military authorities reported this weekend that it had detected three dozen PLA planes, multiple naval vessels and one “official” ship, which was likely the maritime patrol, operating around the territory over the previous day.

Maps provided by the ministry showed up to three drones operating near the island and the Japanese islands off its north-east coast, seeming to travel unusually near to the nearby Japanese island. PLA movements there are not rare, but infrequent, and Beijing's defense operations in the island's ADIZ generally has been low in the past month.

Earlier this weekend, the defense officials said China had been carrying out another “joint combat patrol” to “harass the airspace and sea around us”. It noted Taiwan had dispatched military assets to monitor the situation. Taiwan documents these operations a couple of times a month as part of what the Taiwanese government says is an ongoing military pressure campaign.

Diplomatic Pressure

Tokyo has been facing mounting pressure from Beijing since the Japanese official made her comments, with China’s consul general in Osaka prompting a formal protest from Japan by commenting that “the dirty head that sticks itself out must be cut off”.

China 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, prompting Tokyo to urge Beijing to take “suitable actions”, though it provided no details.

Three Chinese airlines announced this weekend that flights to Tokyo could be refunded or changed for free.

Adding to the tensions, Beijing's administration on the weekend urged its citizens to “carefully reconsider” studying in Japan, citing what it characterized as an unstable security environment.

While the advice does not amount to a ban, a dramatic reduction in the number of Chinese students could have a negative impact on academic institutions in Japan. A historic high of over 336,000 international students were studying in Japan last year, according to education statistics. They featured over 123,000 learners from China – by far the single biggest group.

Official Commentary

Earlier this weekend, a official press commentary charged the Japanese official with performing a diplomatic maneuver 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 nations, including the United States, and could quickly spiral into a major confrontation with unimaginable consequences.”

Strategic Positions

The government of Taiwan says the island's residents alone determine their destiny. Japanese leaders have traditionally refrained from discussing the island openly when discussing such scenarios, maintaining a “strategic ambiguity” also favoured by Tokyo’s main security ally, the US.

Nevertheless, Beijing's governing party says the incorporation of the island 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 statements towards Taiwan.