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China has deployed its coast guard through the waters of the Diaoyu islands and unmanned aerial vehicles near outlying Japan's territory as China escalates tensions over the Japanese prime minister’s remarks regarding Taiwan.

Patrol Operations

This past Sunday, the Chinese coast guard announced 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 Beijing.

“Chinese maritime patrol unit 1307 conducted patrols within the territorial waters of the Diaoyu 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 islands but the recent developments come amid an intensifying diplomatic spat after the Japanese prime minister, Sanae Takaichi, addressed lawmakers that if Beijing assaults the self-governing island of Taiwan it might provoke a military response from Tokyo.

That provoked a furious reaction from Beijing, which has indicated it demands a retraction from the Japanese official.

Taiwan's Position

Beijing asserts Taiwan as its own territory and intends to annex it under what it describes as “unification”. It has not ruled out the military option. The island's administration and citizens overwhelmingly reject the prospect of Chinese rule – choosing to preserve the current situation without formally announcing independence, but vowing to defend themselves if required.

An military assault by Beijing would threaten to spiral into a international confrontation, possibly drawing in the US and other partner nations including Japan, which has territory just 110km (68 miles) from Taiwan.

Military Activity

In Taiwan, the defence ministry said on Sunday morning that it had observed three dozen PLA planes, multiple naval vessels and one government vessel, which was likely the coast guard, active near the island over the previous day.

Official charts released showed up to multiple UAVs operating near Taiwan and the Japanese islands off its north-east coast, appearing to go unusually near to Yonaguni. Chinese military transits there are occasional, but uncommon, and Chinese military activity in Taiwan’s air defence identification zone generally has been minimal in recent weeks.

Earlier this weekend, the ministry said China had been conducting another “combined military exercise” to “harass the airspace and sea around us”. It noted the island had sent its own aircraft and ships to monitor the situation. Taiwan documents these operations a couple of times a month as part of what the Taiwanese government says is an continuous strategic pressure.

Diplomatic Pressure

Japan has been facing mounting pressure from China since Takaichi made her comments, with Beijing's diplomatic representative in the Japanese city prompting a formal protest from Tokyo by commenting that “those who interfere will face consequences”.

China then summoned the Japanese ambassador for the first occasion since 2023, and Beijing's military authorities declared that any Japanese intervention would be certain to collapse.

Travel and Education Advisory

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

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

In another escalation, China’s government on the weekend advised students to rethink education plans in Japan, citing what it characterized as an volatile safety situation.

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 historic high of over 336,000 international students were enrolled in Japanese schools last year, according to official data. They included more than 123,000 Chinese students – by far the single biggest group.

Official Commentary

Earlier this weekend, a Chinese state media editorial charged the Japanese official with performing a diplomatic maneuver that was “not just dangerously provocative but fundamentally perverse”.

“A clash between Tokyo and Beijing would not be a limited skirmish; 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 preferred by Japan's primary defense partner, the United States.

Nevertheless, China’s ruling Communist party says the unification of Taiwan with the People’s Republic of China is “inevitable”, and casts any opposition to it as escalatory. As it advances toward potential armed takeover, China has also been increasing its political operations and its rhetoric towards the island.