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Beijing has sent its coast guard through the waters of the Diaoyu islands and military drones past outlying Japan's territory as Beijing escalates tensions following the Japan's leader's remarks regarding the island of Taiwan.

Patrol Operations

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

“Chinese maritime patrol unit 1307 performed surveillance within the territorial waters 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.

Bilateral Tensions

China and Japan have consistently clashed around the islands but the latest activity come amid an intensifying diplomatic spat after the Japan's leader, Sanae Takaichi, told parliament that if Beijing assaults the self-governing island of Taiwan it could trigger a military response from Japan.

That sparked an angry response 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 use of force. Taiwan’s government and citizens overwhelmingly reject the prospect of Chinese rule – preferring to maintain the status quo without explicitly declaring themselves independent, but vowing to defend themselves if necessary.

An military assault by China would threaten to spiral into a regional or global conflict, potentially involving the United States and other partner nations including Tokyo, which has land just 68 miles from the island.

Military Activity

In Taiwan, the defence ministry said on Sunday morning that it had observed 30 Chinese military aircraft, multiple naval vessels and one “official” ship, which was probably the maritime patrol, active near the territory over the past 24 hours.

Official charts released showed up to multiple UAVs flying between the island and the Japanese islands off its northeastern shoreline, appearing to go particularly close to the nearby Japanese island. Chinese military transits there are not rare, but infrequent, and Chinese military activity in the island's ADIZ generally has been minimal in recent weeks.

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

Political Strain

Tokyo has been experiencing increased strain from China since Takaichi made her remarks, with Beijing's diplomatic representative in Osaka triggering an official complaint from Tokyo by commenting that “the dirty head that sticks itself out must be cut off”.

China then called in Japan's diplomat for the first time in more than two years, and Beijing's military authorities stated 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 “suitable actions”, though it provided no details.

Multiple carriers from China said on Saturday that flights to Tokyo could be cancelled without penalty.

Adding to the tensions, China’s government on the weekend 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 Japanese universities. A record 336,708 foreign nationals were enrolled in Japanese schools last year, according to education statistics. They featured over 123,000 learners from China – by far the largest demographic.

Media Response

Earlier this weekend, a official press commentary accused Takaichi of staging a diplomatic maneuver that was “not just dangerously provocative but fundamentally perverse”.

“A clash between Tokyo and Beijing would not be a small-scale encounter; it would probably involve other nations, including the United States, and could rapidly escalate to a major confrontation with unimaginable consequences.”

Strategic Positions

The administration in Taipei says only its people can decide its future. Japanese leaders have previously avoided publicly mentioning Taiwan when addressing potential conflicts, maintaining a “strategic ambiguity” also preferred by Japan's primary defense partner, the United States.

Nevertheless, Beijing's governing 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.