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Beijing has sent its maritime law enforcement through the maritime area of the Diaoyu islands and unmanned aerial vehicles past remote Japanese territory as China escalates strains following the Japanese prime minister’s remarks regarding Taiwan.

Rights Enforcement Activities

On Sunday, the China's maritime patrol stated that its vessels carried out a “rights enforcement patrol” through the territorial seas of the Diaoyu islands, which are under the control of Tokyo but also asserted as territory by Beijing.

“Chinese maritime patrol unit 1307 performed surveillance within the maritime jurisdiction of the Senkaku islands. This was a legitimate rights enforcement activity undertaken by the China coast guard to uphold its rights and interests,” the statement said.

Diplomatic Spat

Beijing and Tokyo have repeatedly faced off around the disputed territory but the recent developments occur during an intensifying diplomatic spat after the Japan's leader, the Japanese official, addressed lawmakers that if Beijing assaults the self-governing island of Taiwan it might provoke a military response from Japan.

That sparked an angry response from Beijing, which has indicated it demands a withdrawal from Takaichi.

Taiwan's Position

China claims Taiwan as its sovereign land and plans to incorporate it under what it terms “unification”. It has left open the use of force. Taiwan’s government and people overwhelmingly reject the prospect of Chinese rule – preferring to maintain the current situation without explicitly declaring themselves independent, but vowing to defend themselves if necessary.

An attack or invasion by China would risk escalating into a regional or global conflict, potentially involving the US and other partner nations including Tokyo, which has territory just 68 miles from the island.

Military Activity

On the island, the military authorities said on Sunday morning 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 past 24 hours.

Official charts released showed up to three drones operating near the island and the Japan's territory off its north-east coast, appearing to go unusually near to Yonaguni. PLA movements there are occasional, but infrequent, and Chinese military activity in the island's ADIZ generally has been minimal in recent weeks.

Earlier this weekend, the ministry said Beijing had been conducting another “combined military exercise” to “harass the airspace and sea around us”. It added Taiwan had sent its own aircraft and ships to track the developments. Taiwan documents these operations a few times monthly as part of what the Taiwanese government says is an ongoing military pressure campaign.

Political Strain

Tokyo has been facing mounting pressure from China since Takaichi made her remarks, with China’s consul general in Osaka prompting a formal protest from Japan by stating that “the dirty head that sticks itself out must be cut off”.

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

Warning for Citizens

Late last week, China advised its people to avoid visiting Japan, prompting Tokyo to urge Beijing to take “appropriate measures”, though it provided no details.

Multiple carriers from China announced this weekend that tickets to Japan could be refunded or changed for free.

In another escalation, China’s government 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 number of Chinese students could have a negative impact on academic institutions in Japan. A record 336,708 foreign nationals were studying in Japan last year, according to education statistics. They featured over 123,000 learners from China – by far the largest demographic.

Official Commentary

Late on Saturday, a Chinese state media editorial 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 US, and could rapidly escalate to a large-scale conflict with severe repercussions.”

Policy Standpoints

The government of Taiwan says the island's residents alone determine their destiny. Japanese leaders have previously avoided publicly mentioning Taiwan when discussing such scenarios, maintaining a “deliberate vagueness” 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 moves towards being capable of military annexation, China has also been escalating its non-military activity and its rhetoric towards Taiwan.