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China has deployed its coast guard into the waters of the Diaoyu islands and unmanned aerial vehicles near outlying Japanese territory as Beijing escalates tensions over the Japanese prime minister’s comments regarding Taiwan.

Patrol Operations

On Sunday, the China's maritime patrol announced that its ships carried out a “lawful patrol operation” through the waters of the Senkaku, which are under the control of Tokyo but also claimed by Beijing.

“Chinese maritime patrol unit 1307 performed surveillance within the maritime jurisdiction of the Senkaku islands. This was a lawful patrol operation undertaken by the Chinese maritime authorities to protect its sovereign claims,” officials declared.

Diplomatic Spat

China and Japan have repeatedly faced off around the disputed territory but the recent developments occur during an intensifying diplomatic spat after the Japan's leader, Sanae Takaichi, told parliament that if Beijing assaults democratically ruled Taiwan it might provoke a armed reaction from Tokyo.

That provoked a furious reaction from China, which has signalled it expects a withdrawal from the Japanese official.

Taiwan's Position

Beijing asserts Taiwan as its sovereign land and intends to annex it under what it terms “reunification”. It has not ruled out the military option. The island's administration and citizens categorically refuse the prospect of Chinese rule – preferring to maintain the current situation without explicitly declaring themselves independent, but vowing to defend themselves if required.

An attack or invasion by China would risk escalating into a regional or global conflict, potentially involving the US and other partner nations including Japan, which has territory just 110km (68 miles) from the island.

Defense Operations

In Taiwan, the defence ministry reported this weekend that it had observed three dozen PLA planes, seven navy ships and one government vessel, which was probably the coast guard, operating around the territory over the past 24 hours.

Maps provided by the ministry showed up to multiple UAVs flying between the island and the Japan's territory off its northeastern shoreline, seeming to travel particularly close to the nearby Japanese island. PLA movements there are not rare, but uncommon, and Chinese military activity in the island's ADIZ generally has been minimal in the past month.

Earlier this weekend, the ministry said China had been conducting another “combined military exercise” to “test our defensive capabilities”. It noted the island had dispatched military assets to track the developments. The island reports such Chinese patrols a few times monthly as part of what the Taiwanese government says is an continuous strategic pressure.

Political Strain

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

Beijing then summoned the Japanese ambassador for the first occasion since 2023, 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, prompting Tokyo to urge Beijing to take “appropriate measures”, though it provided no details.

Three Chinese airlines said on Saturday that flights to Tokyo could be cancelled without penalty.

Adding to the tensions, China’s government on Sunday urged its citizens to “carefully reconsider” studying in Japan, citing what it characterized as an volatile safety situation.

While the advice does not amount to a ban, a significant decrease in the number of Chinese students 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 education statistics. They included more than 123,000 Chinese students – 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 “both reckless and fundamentally flawed”.

“A conflict between Japan and China would not be a limited skirmish; it would probably involve 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 discussing such scenarios, maintaining a “deliberate vagueness” also preferred by Tokyo’s main security ally, the US.

Nevertheless, Beijing's governing party says the unification of Taiwan with the mainland China is “inevitable”, 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 the island.