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Beijing has sent its coast guard through the waters of the Diaoyu islands and unmanned aerial vehicles past remote Japan's territory as Beijing escalates strains over the Japanese prime minister’s remarks regarding the island of Taiwan.

Patrol Operations

This past Sunday, the China's maritime patrol stated that its ships carried out a “rights enforcement patrol” through the waters of the Diaoyu islands, which are administered by Tokyo but also asserted as territory by Beijing.

“China coast guard vessel 1307 formation conducted patrols within the maritime jurisdiction of the Senkaku islands. This was a lawful patrol operation conducted by the China coast guard to protect its sovereign claims,” officials declared.

Bilateral Tensions

Beijing and Tokyo have repeatedly faced off around the islands but the recent developments occur during an intensifying diplomatic spat after the Japan's leader, Sanae Takaichi, addressed lawmakers that if Beijing assaults democratically ruled Taiwan it could trigger a armed reaction from Tokyo.

That provoked a furious reaction from Beijing, which has signalled it expects a retraction from Takaichi.

Taiwan's Position

China claims Taiwan as its own territory and intends to annex it under what it terms “reunification”. It has left open the military option. The island's administration and people categorically refuse the prospect of Chinese rule – preferring to maintain the current situation without explicitly declaring themselves independent, but pledging to protect their sovereignty if necessary.

An military assault by Beijing would threaten to spiral into a international confrontation, potentially involving the US and other allies including Japan, which has territory just 68 miles from Taiwan.

Defense Operations

On the island, the military authorities said on Sunday morning that it had detected three dozen PLA planes, seven navy ships and one “official” ship, which was likely the coast guard, active near the territory over the previous day.

Maps provided by the ministry showed up to multiple UAVs operating near the island and the Japanese islands off its northeastern shoreline, seeming to travel unusually near to the nearby Japanese island. PLA movements there are not rare, but uncommon, and Beijing's defense operations in the island's ADIZ generally has been low in the past month.

Late on Saturday, the ministry said Beijing had been conducting another “joint combat patrol” to “harass the airspace and sea around us”. It noted the island had sent its own aircraft and ships to track the developments. Taiwan reports such Chinese patrols a few times monthly as part of what the Taiwanese government says is an continuous strategic pressure.

Diplomatic Pressure

Tokyo has been experiencing increased strain from China since the Japanese official made her comments, with China’s consul general in the Japanese city prompting a formal protest from Tokyo by commenting that “those who interfere will face consequences”.

Beijing then summoned the Japanese ambassador for the first occasion since 2023, and Beijing's military authorities stated that any Tokyo's involvement would be certain to collapse.

Warning for Citizens

On Friday, China cautioned its citizens against travelling to Japan, prompting Tokyo to urge Beijing to take “appropriate measures”, though it did not elaborate.

Multiple carriers from China announced this weekend that flights to Tokyo could be refunded or changed for free.

Adding to the tensions, China’s government on Sunday advised students to rethink education plans in Japan, citing what it characterized as an unstable security environment.

Although not an outright prohibition, 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 enrolled in Japanese schools last year, according to education statistics. They included more than 123,000 Chinese students – by far the single biggest group.

Media Response

Late on Saturday, 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 rapidly escalate to a major confrontation with unimaginable consequences.”

Strategic Positions

The administration in Taipei says the island's residents alone determine their destiny. Officials in Tokyo have previously avoided publicly mentioning Taiwan when discussing such scenarios, maintaining a “deliberate vagueness” also favoured by Japan's primary defense partner, the US.

However, China’s ruling Communist party says the incorporation of the island with the mainland China is “unavoidable”, and portrays dissent as provocative. As it advances toward potential armed takeover, China has also been escalating its non-military activity and its rhetoric towards the island.