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Beijing has deployed its coast guard through the maritime area of the Diaoyu islands and unmanned aerial vehicles near remote Japan's territory as China ramps up strains following the Japan's leader's remarks regarding Taiwan.

Patrol Operations

On 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 Japan but also asserted as territory by Beijing.

“Chinese maritime patrol unit 1307 performed surveillance within the maritime jurisdiction of the Diaoyu islands. This was a lawful patrol operation conducted by the China coast guard to uphold its rights and interests,” the statement said.

Bilateral Tensions

China and Japan have repeatedly faced off around the islands but the latest activity occur during an escalating political dispute after the Japanese prime minister, the Japanese official, addressed lawmakers that if Beijing assaults democratically ruled Taiwan it could trigger a armed reaction from Tokyo.

That sparked an angry response from Beijing, which has signalled it expects a withdrawal 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 use of force. The island's administration and citizens categorically refuse the prospect of Chinese rule – choosing to preserve the current situation without formally announcing independence, but pledging to protect their sovereignty if required.

An attack or invasion by China would risk escalating into a international confrontation, possibly drawing in the US and other partner nations including Tokyo, which has land just 68 miles from the island.

Military Activity

In Taiwan, the military authorities reported this weekend that it had detected three dozen PLA planes, multiple naval vessels and one “official” ship, which was probably the coast guard, operating around the island over the previous day.

Official charts released showed up to multiple UAVs flying between the island and the Japan's territory off its northeastern shoreline, seeming to travel unusually near to the nearby Japanese island. Chinese military transits there are not rare, but uncommon, and Chinese military activity in Taiwan’s air defence identification zone generally has been low 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 added Taiwan had dispatched military assets to monitor the situation. The island documents these operations a few times monthly as part of what the Taiwanese government says is an ongoing military pressure campaign.

Political Strain

Japan has been facing mounting pressure from Beijing since the Japanese official made her remarks, with China’s consul general in the Japanese city prompting a formal protest from Tokyo 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 Beijing's military authorities stated that any Tokyo's involvement would be doomed to fail.

Travel and Education Advisory

Late last week, Beijing advised its people to avoid visiting Japan, leading Japan to request China to take “suitable actions”, though it did not elaborate.

Three Chinese airlines said on Saturday that flights to Tokyo could be refunded or changed for free.

In another escalation, Beijing's administration on the weekend 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 significant decrease in the number of Chinese students could have a negative impact on Japanese universities. A record 336,708 foreign nationals were enrolled in Japanese schools last year, according to official data. They included more than 123,000 Chinese students – by far the largest demographic.

Official Commentary

Earlier this weekend, a official press commentary accused Takaichi of staging a political stunt that was “both reckless and fundamentally flawed”.

“A clash between Tokyo and Beijing would not be a small-scale encounter; it would likely draw in other powers, including the US, and could rapidly escalate to a large-scale conflict with severe repercussions.”

Strategic Positions

The government of Taiwan says only its people can decide its future. Officials in Tokyo have traditionally refrained from publicly mentioning Taiwan when addressing potential conflicts, maintaining a “strategic ambiguity” also preferred by Tokyo’s main security ally, the United States.

However, Beijing's governing party says the incorporation of the island with the People’s Republic of China is “inevitable”, and portrays dissent as provocative. As it moves towards being capable of military annexation, Beijing has also been escalating its non-military activity and its statements towards Taiwan.