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Beijing has sent its coast guard into the maritime area of the Diaoyu islands and unmanned aerial vehicles past outlying Japan's territory as China escalates tensions over the Japan's leader's remarks regarding the island of Taiwan.

Rights Enforcement Activities

On Sunday, the China's maritime patrol stated that its ships conducted a “lawful patrol operation” through the territorial seas of the Senkaku, which are under the control of Tokyo but also claimed by China.

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

Diplomatic Spat

China and Japan have consistently clashed around the islands but the latest activity occur during an intensifying diplomatic spat after the Japan's leader, Sanae Takaichi, addressed lawmakers that if Beijing assaults the self-governing island of Taiwan it could trigger a military response from Tokyo.

That sparked an angry response from Beijing, which has indicated it demands a withdrawal from Takaichi.

Island's Stance

Beijing asserts Taiwan as its own territory and plans to incorporate it under what it terms “unification”. It has not ruled out the military option. The island's administration and people categorically refuse the prospect of Chinese rule – preferring to maintain the current situation without formally announcing independence, but vowing to defend themselves if necessary.

An attack or invasion by Beijing would risk escalating into a regional or global conflict, possibly drawing in the US and other partner nations including Japan, which has land just 110km (68 miles) from Taiwan.

Defense Operations

On the island, the defence ministry said on Sunday morning that it had observed three dozen PLA planes, seven navy ships and one government vessel, which was probably the maritime patrol, active near the island over the previous day.

Official charts released showed up to three drones operating near Taiwan and the Japanese islands off its north-east coast, seeming to travel particularly close to Yonaguni. Chinese military transits there are occasional, but uncommon, and Chinese military activity in Taiwan’s air defence identification zone generally has been low in the past month.

Late on Saturday, the ministry said China had been carrying out another “combined military exercise” to “harass the airspace and sea around us”. It added the island had sent its own aircraft and ships to track the developments. The island documents these operations a few times monthly as part of what the Taiwanese government says is an continuous strategic pressure.

Diplomatic Pressure

Japan has been facing mounting pressure from China since Takaichi made her remarks, with China’s consul general in Osaka triggering an official complaint from Japan by commenting that “the dirty head that sticks itself out must be cut off”.

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

Warning for Citizens

Late last week, Beijing cautioned its citizens against travelling to Japan, prompting Tokyo to urge Beijing to take “suitable actions”, though it did not elaborate.

Multiple carriers from China announced this weekend that flights to Tokyo could be cancelled without penalty.

In another escalation, China’s government on Sunday urged its citizens to “carefully reconsider” studying in Japan, citing what it described 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 detrimental effect on Japanese universities. A record 336,708 foreign nationals were studying in Japan last year, according to education statistics. They featured over 123,000 learners from China – by far the largest demographic.

Media Response

Late on Saturday, a Chinese state media editorial accused Takaichi of staging a political stunt that was “both reckless and fundamentally flawed”.

“A clash between Tokyo and Beijing would not be a limited skirmish; it would probably involve other nations, including the United States, and could quickly spiral into a large-scale conflict with unimaginable consequences.”

Policy Standpoints

The administration in Taipei says only its people can decide its future. Japanese leaders have traditionally refrained from discussing the island openly when addressing potential conflicts, maintaining a “strategic ambiguity” also favoured by Tokyo’s main security ally, the United States.

However, Beijing's governing party says the incorporation of the island 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 escalating its non-military activity and its rhetoric towards the island.