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Beijing has deployed its maritime law enforcement into the waters of the Diaoyu islands and military drones near outlying Japanese territory as China ramps up strains following the Japanese prime minister’s remarks regarding the island of Taiwan.

Rights Enforcement Activities

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

“Chinese maritime patrol unit 1307 performed surveillance within the territorial waters of the Senkaku islands. This was a legitimate rights enforcement activity conducted by the Chinese maritime authorities to uphold its rights and interests,” officials declared.

Bilateral Tensions

China and Japan have repeatedly faced off around the islands but the recent developments come amid 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 Japan.

That sparked an angry response from Beijing, which has indicated it demands a retraction from the Japanese official.

Taiwan's Position

China claims the island as its own territory and intends to annex it under what it terms “unification”. It has left open the military option. Taiwan’s government and people categorically refuse the idea of Beijing's control – choosing to preserve the status quo without formally announcing independence, but vowing to defend themselves if required.

An attack or invasion by Beijing would threaten to spiral into a regional or global conflict, potentially involving the US and other allies including Tokyo, which has territory just 68 miles from Taiwan.

Defense Operations

On the island, the defence ministry 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, operating around the island over the previous day.

Maps provided by the ministry showed up to multiple UAVs operating near Taiwan and the Japan's territory off its northeastern shoreline, appearing to go particularly close to the nearby Japanese island. PLA movements there are occasional, but uncommon, and Beijing's defense operations in Taiwan’s air defence identification zone generally has been minimal in the past month.

Late on Saturday, the defense officials said China had been carrying out another “combined military exercise” to “test our defensive capabilities”. It added the island had dispatched military assets to monitor the situation. The island documents these operations a few times monthly as part of what Taipei says is an continuous strategic pressure.

Diplomatic Pressure

Tokyo has been experiencing increased strain from Beijing since the Japanese official made her remarks, with Beijing's diplomatic representative in the Japanese city triggering an official complaint from Japan by stating that “those who interfere will face consequences”.

China then summoned the Japanese ambassador for the first time in more than two years, and China’s defence ministry stated that any Tokyo's involvement would be certain to collapse.

Travel and Education Advisory

Late last week, China advised its people to avoid visiting Japan, leading Japan to request China to take “appropriate measures”, though it provided no details.

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

In another escalation, China’s government on the weekend advised students to rethink education plans in Japan, citing what it described as an unstable security environment.

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 record 336,708 foreign nationals were studying in Japan last year, according to official data. 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 diplomatic maneuver that was “not just dangerously provocative but fundamentally perverse”.

“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 major confrontation with severe repercussions.”

Policy Standpoints

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 “deliberate vagueness” also favoured by Japan's primary defense partner, the United States.

However, China’s ruling Communist party says the incorporation of the island with the People’s Republic of China is “unavoidable”, and casts any opposition to it as escalatory. As it moves towards being capable of military annexation, China has also been increasing its political operations and its statements towards the island.