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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 China escalates strains over the Japan's leader's remarks regarding Taiwan.

Patrol Operations

On Sunday, the Chinese coast guard announced that its ships 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 China.

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

Diplomatic Spat

Beijing and Tokyo have consistently clashed around the disputed territory but the recent developments come amid 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 Tokyo.

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

Island's Stance

Beijing asserts the island as its sovereign land and plans to incorporate it under what it terms “unification”. It has left open the military option. Taiwan’s government and citizens categorically refuse the prospect of Chinese rule – preferring to maintain the current situation without explicitly declaring themselves independent, but vowing to defend themselves if required.

An attack or invasion by China would risk escalating into a regional or global conflict, potentially involving the United States and other allies including Japan, which has land just 68 miles from the island.

Defense Operations

In Taiwan, the defence ministry said on Sunday morning that it had detected three dozen PLA planes, multiple naval vessels and one government vessel, which was probably the maritime patrol, operating around the territory over the previous day.

Maps provided by the ministry showed up to multiple UAVs operating near the island and the Japan's territory off its northeastern shoreline, appearing to go particularly close to Yonaguni. PLA movements there are not rare, but uncommon, and Beijing's defense operations in Taiwan’s air defence identification zone generally has been low 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 added the island had sent its own aircraft and ships to monitor the situation. Taiwan documents these operations a few times monthly as part of what the Taiwanese government says is an continuous strategic pressure.

Political Strain

Japan has been experiencing increased strain from China since the Japanese official made her remarks, with China’s consul general in the Japanese city triggering an official complaint from Japan by commenting 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 declared that any Tokyo's involvement would be doomed to fail.

Warning for Citizens

On Friday, Beijing cautioned its citizens against travelling to Japan, leading Japan to request China to take “suitable actions”, though it provided no details.

Three Chinese airlines announced this weekend that flights to Tokyo could be cancelled without penalty.

In another escalation, Beijing's administration on Sunday advised students to rethink education plans in Japan, citing what it described 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 academic institutions in Japan. 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

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 major confrontation with severe repercussions.”

Strategic Positions

The government of Taiwan says only its people can decide its future. Japanese leaders have traditionally refrained from publicly mentioning Taiwan when addressing potential conflicts, maintaining a “deliberate vagueness” also preferred by Tokyo’s main security ally, the US.

However, Beijing's governing party says the unification of Taiwan with the People’s Republic of China is “unavoidable”, and casts any opposition to it as escalatory. As it moves towards being capable of military annexation, Beijing has also been escalating its non-military activity and its statements towards the island.