A military helicopter carrying a Taiwan flag flies over near the Taipei 101 building, as part of the rehearsal ahead of the Double Ten National Day celebration, amid China’s growing military threats, in New Taipei, Taiwan, on Tuesday.

Ceng Shou Yi/NurPhoto via Getty Images

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Ceng Shou Yi/NurPhoto via Getty Images

A military helicopter carrying a Taiwan flag flies over near the Taipei 101 building, as part of the rehearsal ahead of the Double Ten National Day celebration, amid China’s growing military threats, in New Taipei, Taiwan, on Tuesday.

Ceng Shou Yi/NurPhoto via Getty Images

Tensions between Taipei and Beijing are at their worst in more than 40 years, Taiwan’s defense minister says, citing a recent increase in incursions by Chinese military aircraft into the island’s air defense identification zone.

Although no shots have been fired, Taiwan says that nearly 150 aircraft belonging to China’s People’s Liberation Army Air Force entered the zone in a four-day period beginning Friday, as part of what Taiwan calls a strategy of harassment.

Defense Minister Chiu Kuo-cheng called the situation “the most serious” in the more than 40 years since he joined the military.

Taiwan is a self-governed island of about 24 million people off the Chinese coast that the Beijing considers part of its territory.

The Biden administration said this week that it is in contact with Taiwan over the incursions and is “conveying clear messages through diplomatic channels,” according to White House press secretary Jen Psaki.

“We remain concerned by the People’s Republic of China’s provocative military activity near Taiwan, which is destabilizing, risks miscalculations and undermines regional peace and stability,” she said at a Monday press briefing, emphasizing that the U.S. commitment to Taipei is “rock solid.”

On Tuesday, President Biden said that he had spoken with Chinese President Xi Jinping about Taiwan and they had agreed to abide by the “Taiwan agreement,” an apparent reference to the long-standing policy under which Washington recognizes Beijing over Taipei as long as China doesn’t attack the island.

Japan and Australia have also reportedly urged Taipei and Beijing to talk.

On Tuesday, Taiwan reported a record 56 Chinese aircraft flew into its air identification zone in a single day.

“Taiwan must be on alert. China is more and more over the top,” Premier Su Tseng-chang told reporters in Taipei on Tuesday, adding that the island must “strengthen itself” against the external threat.

Citing a new internal report, Taiwan’s defense minister, Chiu Kuo-cheng, warned on Wednesday that China could have the military capacity to blockade the Taiwan Strait as soon as 2025. Chiu said such a capability would pose a “grave challenge” to the self-governed island.

The report said that about 380 Chinese warplanes entered Taiwan’s air defense zone last year and that more than 600 such incursions have taken place so far this year. It also noted that Beijing now has two aircraft carriers, and is increasing production of submarines and destroyers while building up its amphibious assault capabilities.

On Sunday, in a response to the escalating situation between Taipei and Beijing and Washington’s role in the current tensions, China’s foreign ministry spokesperson, Hua Chunying said: “Taiwan belongs to China and the U.S. is in no position to make irresponsible remarks.”