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China has sent its maritime law enforcement into the maritime area of the Diaoyu islands and unmanned aerial vehicles near outlying Japan's territory as Beijing escalates strains following the Japan's leader's remarks regarding the island of Taiwan.

Patrol Operations

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

“Chinese maritime patrol unit 1307 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.

Bilateral Tensions

Beijing and Tokyo have consistently clashed around the islands but the recent developments occur during an escalating political dispute after the Japanese prime minister, the Japanese official, addressed lawmakers that if Beijing assaults the self-governing island of Taiwan it could trigger a armed reaction from Japan.

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

Island's Stance

Beijing asserts Taiwan as its sovereign land and plans to incorporate it under what it terms “reunification”. It has not ruled out the military option. The island's administration and people categorically refuse the idea of Beijing's control – choosing to preserve the current situation without explicitly declaring themselves independent, but pledging to protect their sovereignty if necessary.

An attack or invasion by Beijing would threaten to spiral into a regional or global conflict, potentially involving the United States and other partner nations including Japan, which has territory just 110km (68 miles) from the island.

Defense Operations

In Taiwan, the defence ministry said on Sunday morning that it had observed 30 Chinese military aircraft, multiple naval vessels and one “official” ship, which was probably the coast guard, operating around the island over the past 24 hours.

Maps provided by the ministry showed up to multiple UAVs flying between the island and the Japanese islands off its northeastern shoreline, appearing to go particularly close to Yonaguni. PLA movements there are occasional, but infrequent, and Beijing's defense operations in the island's ADIZ generally has been minimal in the past month.

Late on Saturday, the ministry said Beijing had been carrying out another “combined military exercise” to “test our defensive capabilities”. It noted the island had dispatched military assets to monitor the situation. The island reports such Chinese patrols a couple of times a month 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 Tokyo by commenting that “the dirty head that sticks itself out must be cut off”.

China then called in Japan's diplomat for the first time in more than two years, and China’s defence ministry stated that any Tokyo's involvement would be doomed to fail.

Travel and Education Advisory

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

Three Chinese airlines said on Saturday that tickets to Japan could be cancelled without penalty.

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 population of learners from China 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 included more than 123,000 Chinese students – by far the largest demographic.

Official Commentary

Late on Saturday, a official press commentary accused Takaichi of staging a political stunt that was “both reckless and fundamentally flawed”.

“A conflict between Japan and China would not be a small-scale encounter; it would probably involve other nations, including the US, and could rapidly escalate to a major confrontation with severe repercussions.”

Strategic Positions

The government of Taiwan says only its people can decide its future. Japanese leaders have previously avoided discussing the island openly when discussing such scenarios, maintaining a “strategic ambiguity” also preferred by Japan's primary defense partner, the United States.

Nevertheless, 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 statements towards the island.