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China has sent its coast guard through the waters of the Diaoyu islands and military drones near outlying Japan's territory as Beijing escalates strains following the Japanese prime minister’s remarks regarding the island of Taiwan.

Rights Enforcement Activities

On Sunday, the China's maritime patrol announced that its vessels carried out a “rights enforcement patrol” through the waters of the Diaoyu islands, which are under the control of Japan but also claimed by China.

“Chinese maritime patrol unit 1307 performed surveillance within the territorial waters of the Diaoyu islands. This was a lawful patrol operation 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 latest activity 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 military response from Japan.

That provoked a furious reaction 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 “reunification”. It has left open the use of force. Taiwan’s government and citizens categorically refuse the idea of Beijing's control – preferring to maintain the status quo without explicitly declaring themselves independent, but pledging to protect their sovereignty if necessary.

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

Defense Operations

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

Maps provided by the ministry showed up to three drones flying between the island and the Japanese islands off its north-east coast, appearing to go unusually near to the nearby Japanese island. Chinese military transits 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 defense officials said Beijing had been carrying out another “joint combat patrol” to “test our defensive capabilities”. It added Taiwan had dispatched military assets to track the developments. The island reports such Chinese patrols a few times monthly as part of what Taipei says is an continuous strategic pressure.

Political Strain

Tokyo has been facing mounting pressure from Beijing since Takaichi made her comments, with Beijing's diplomatic representative in Osaka triggering an official complaint 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 Japanese intervention would be certain to collapse.

Travel and Education Advisory

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

Multiple carriers from China said on Saturday that tickets to Japan could be refunded or changed for free.

In another escalation, Beijing's administration on Sunday 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 dramatic reduction in the population of learners from China could have a detrimental effect on Japanese universities. A record 336,708 foreign nationals were enrolled in Japanese schools last year, according to official data. They featured over 123,000 learners from China – by far the single biggest group.

Official Commentary

Earlier this weekend, a official press commentary charged the Japanese official with performing 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 powers, including the US, and could quickly spiral into a major confrontation with unimaginable consequences.”

Policy Standpoints

The government of Taiwan says the island's residents alone determine their destiny. Officials in Tokyo have previously avoided discussing the island openly when addressing potential conflicts, maintaining a “strategic ambiguity” also preferred by Tokyo’s main security ally, the United States.

Nevertheless, Beijing's governing party says the unification of Taiwan with the mainland China is “unavoidable”, and casts any opposition to it as escalatory. As it advances toward potential armed takeover, Beijing has also been increasing its political operations and its statements towards the island.