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

Patrol Operations

On Sunday, the Chinese coast guard announced that its ships conducted a “lawful patrol operation” through the territorial seas of the Diaoyu islands, which are under the control of Japan but also asserted as territory by Beijing.

“China coast guard vessel 1307 formation conducted patrols within the territorial waters of the Diaoyu islands. This was a lawful patrol operation conducted by the China coast guard to uphold its rights and interests,” officials declared.

Diplomatic Spat

China and Japan have repeatedly faced off around the disputed territory but the latest activity come amid an escalating political dispute after the Japan's leader, Sanae Takaichi, addressed lawmakers that if China attack democratically ruled Taiwan it might provoke a military response from Tokyo.

That sparked an angry response from Beijing, which has signalled it expects a retraction from Takaichi.

Island's Stance

Beijing asserts Taiwan as its own territory and intends to annex it under what it describes as “unification”. It has left open the use of force. Taiwan’s government and citizens overwhelmingly reject the prospect of Chinese rule – choosing to preserve the status quo without explicitly declaring themselves independent, but pledging to protect their sovereignty if required.

An military assault by Beijing would threaten to spiral into a international confrontation, possibly drawing in the US and other allies including Japan, which has territory just 110km (68 miles) from the island.

Military Activity

In Taiwan, the military authorities reported this weekend that it had detected 30 Chinese military aircraft, multiple naval vessels and one government vessel, which was likely the coast guard, active near the territory over the past 24 hours.

Official charts released showed up to three drones operating near Taiwan and the Japanese islands off its northeastern shoreline, appearing to go unusually near to the nearby Japanese island. PLA movements there are not rare, but uncommon, and Chinese military activity in Taiwan’s air defence identification zone generally has been minimal in recent weeks.

Earlier this weekend, the ministry said Beijing had been carrying out another “combined military exercise” to “harass the airspace and sea around us”. 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 continuous strategic pressure.

Political Strain

Japan has been experiencing increased strain from Beijing since Takaichi made her comments, with China’s consul general in Osaka triggering an official complaint from Tokyo by stating 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 Japanese intervention would be certain to collapse.

Travel and Education Advisory

On Friday, China advised its people to avoid visiting Japan, leading Japan to request China 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.

In another escalation, China’s government on Sunday advised students to rethink education plans in Japan, citing what it described as an volatile safety situation.

While the advice does not amount to a ban, a dramatic reduction in the population of learners from China could have a detrimental effect on Japanese universities. A record 336,708 foreign nationals were enrolled in Japanese schools last year, according to education statistics. They featured over 123,000 learners from China – by far the single biggest group.

Official Commentary

Late on Saturday, a official press commentary charged the Japanese official with performing a political stunt that was “both reckless and fundamentally flawed”.

“A clash between Tokyo and Beijing would not be a limited skirmish; it would likely draw in other nations, including the United States, and could quickly spiral into a large-scale conflict with severe repercussions.”

Strategic Positions

The government of Taiwan says the island's residents alone determine their destiny. Officials in Tokyo have previously avoided publicly mentioning Taiwan when discussing such scenarios, maintaining a “strategic ambiguity” also preferred by Tokyo’s main security ally, the United States.

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.