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China has deployed its coast guard into the maritime area of the Diaoyu islands and military drones past remote Japan's territory as Beijing escalates strains following the Japanese prime minister’s comments regarding Taiwan.

Rights Enforcement Activities

On Sunday, the China's maritime patrol announced that its vessels carried out a “lawful patrol operation” through the territorial seas of the Diaoyu islands, which are administered by Tokyo but also claimed by China.

“China coast guard vessel 1307 formation performed surveillance within the territorial waters of the Senkaku islands. This was a legitimate rights enforcement activity conducted by the China coast guard to protect its sovereign claims,” the statement said.

Bilateral Tensions

Beijing and Tokyo have consistently clashed around the disputed territory but the recent developments come amid an escalating political dispute after the Japan's leader, Sanae Takaichi, addressed lawmakers that if China attack the self-governing island of Taiwan it could trigger a armed reaction from Tokyo.

That sparked an angry response from China, which has signalled it expects a withdrawal from Takaichi.

Island's Stance

China claims the island as its sovereign land and intends to annex it under what it terms “unification”. It has left open the military option. Taiwan’s government and citizens overwhelmingly reject the prospect of Chinese rule – preferring to maintain the current situation without formally announcing independence, but vowing to defend themselves if required.

An military assault by China would risk escalating into a regional or global conflict, potentially involving the US and other allies including Japan, which has territory just 110km (68 miles) from the island.

Military Activity

On the island, the defence ministry reported this weekend that it had detected three dozen PLA planes, seven navy ships and one “official” ship, which was probably the coast guard, active near the territory over the previous day.

Official charts released showed up to three drones flying between Taiwan and the Japan's territory off its north-east coast, appearing to go particularly close to Yonaguni. PLA movements there are not rare, but uncommon, and Chinese military activity in the island's ADIZ generally has been minimal in recent weeks.

Late on Saturday, the ministry said China had been conducting another “combined military exercise” to “harass the airspace and sea around us”. It noted Taiwan had dispatched military assets to monitor the situation. Taiwan documents these operations a few times monthly as part of what Taipei says is an ongoing military pressure campaign.

Political Strain

Japan has been facing mounting pressure from Beijing since the Japanese official made her comments, 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 occasion since 2023, and Beijing's military authorities declared that any Tokyo's involvement would be certain to collapse.

Travel and Education Advisory

On Friday, Beijing advised its people to avoid visiting Japan, prompting Tokyo to urge Beijing to take “suitable actions”, though it provided no details.

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

In another escalation, China’s government on Sunday urged its citizens to “carefully reconsider” studying in Japan, citing what it characterized as an unstable security environment.

While the advice does not amount to a ban, a dramatic reduction in the number of Chinese students could have a detrimental effect on Japanese universities. A historic high of over 336,000 international students were studying in Japan last year, according to education statistics. They included more than 123,000 Chinese students – by far the largest demographic.

Media Response

Late on Saturday, a official press commentary accused Takaichi of staging a diplomatic maneuver 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 nations, including the United States, and could rapidly escalate to a large-scale conflict with severe repercussions.”

Policy Standpoints

The government of Taiwan says only its people can decide its future. Officials in Tokyo have previously avoided publicly mentioning Taiwan when addressing potential conflicts, maintaining a “deliberate vagueness” also favoured by Tokyo’s main security ally, the United States.

However, China’s ruling Communist party says the unification of Taiwan 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 Taiwan.