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Beijing has deployed its coast guard into the waters of the Senkaku islands and military drones past outlying Japanese territory as China escalates tensions over the Japan's leader's remarks regarding the island of Taiwan.

Patrol Operations

On Sunday, the China's maritime patrol announced that its ships carried out a “rights enforcement patrol” through the waters of the Diaoyu islands, which are administered by Tokyo but also asserted as territory by China.

“China coast guard vessel 1307 formation conducted patrols within the territorial waters of the Senkaku islands. This was a legitimate rights enforcement activity conducted by the Chinese maritime authorities to uphold its rights and interests,” officials declared.

Bilateral Tensions

China and Japan have repeatedly faced off around the disputed territory but the latest activity occur during an intensifying diplomatic spat after the Japanese prime minister, Sanae Takaichi, addressed lawmakers that if Beijing assaults 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 retraction from Takaichi.

Island's Stance

China claims Taiwan as its sovereign land and plans to incorporate it under what it terms “reunification”. It has left open the military option. The island's administration and people categorically refuse the prospect of Chinese rule – choosing to preserve the current situation without explicitly declaring themselves independent, but pledging to protect their sovereignty if required.

An attack or invasion by Beijing would risk escalating into a international confrontation, potentially involving the US and other allies including Japan, which has territory just 68 miles from the island.

Military Activity

In Taiwan, the military authorities reported this weekend that it had detected 30 Chinese military aircraft, multiple naval vessels and one “official” ship, which was probably the maritime patrol, operating around the island over the previous day.

Official charts released showed up to multiple UAVs flying between Taiwan and the Japan's territory off its northeastern shoreline, appearing to go particularly close to Yonaguni. 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 “combined military exercise” to “test our defensive capabilities”. It added Taiwan had sent its own aircraft and ships to monitor the situation. The island documents these operations a few times monthly as part of what Taipei says is an ongoing military pressure campaign.

Diplomatic Pressure

Tokyo has been experiencing increased strain from China since Takaichi made her remarks, with China’s consul general in Osaka prompting a formal protest from Tokyo 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 stated that any Tokyo's involvement would be certain to collapse.

Warning for Citizens

On Friday, China cautioned its citizens against travelling to Japan, leading Japan to request China to take “suitable actions”, though it did not elaborate.

Three Chinese airlines announced this weekend that flights to Tokyo could be refunded or changed for free.

In another escalation, China’s government on Sunday urged its citizens to “carefully reconsider” studying in Japan, citing what it described as an volatile safety situation.

Although not an outright prohibition, a significant decrease 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 single biggest group.

Official Commentary

Late on Saturday, a official press commentary accused Takaichi of staging a political stunt that was “both reckless and fundamentally flawed”.

“A clash between Tokyo and Beijing would not be a limited skirmish; it would probably involve other nations, including the United States, and could quickly spiral into a major confrontation with unimaginable consequences.”

Policy Standpoints

The administration in Taipei says only its people can decide its future. Japanese leaders have traditionally refrained from discussing the island openly when discussing such scenarios, maintaining a “strategic ambiguity” also preferred by Tokyo’s main security ally, the United States.

However, China’s ruling Communist party says the incorporation of the island 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, China has also been increasing its political operations and its statements towards Taiwan.