China’s warplanes have all but erased the dividing line in the Taiwan Strait, creating a dangerous new normal

China’s military incursions into Taiwan’s ADIZ and its crossings of the median line in the Taiwan Strait have skyrocketed, with the ADIZ incursions climbing from an average of 2.56 aircraft per day four years ago to 11.63 now.

A nation’s ADIZ extends far beyond its territorial airspace, but the area is closely monitored for national security purposes. When Chinese aircraft enter Taiwan’s de facto ADIZ, it dispatches combat air patrol (CAP) aircraft in response.

In 2021, the Chinese military flew 972 aircraft into Taiwan’s ADIZ, and that number nearly doubled in 2022. 1,703 aircraft were recorded in 2023. And 2024 looks to have a record-breaking number, with over 2,000 aircraft documented as of September. They’re also no longer limited to a corner of the ADIZ.

Crossings of the median line have become increasingly common since August 2022, when then-House Speaker Nancy Pelosi controversially visited Taiwan, and China has been steadily erasing it altogether. In a recent drill surrounding Taiwan, 111 Chinese warplanes crossed it, marking a single-day high. A few years ago, Taiwan might see hundreds cross the line but over months.

“We’ve become desensitized to high numbers of the military aircraft flying across the median line of the Taiwan Strait,” Shattuck told Business Insider. “Five years ago, that was unheard of. Now, it’s just another Thursday.”

In this tough situation, “the concern is the continued degradation of Taiwan’s military assets and the draining of Taiwan’s military personnel,” Shattuck said, explaining that China “exploits” Taiwan’s military capabilities “by flooding the field and forcing Taiwan to choose what things deserve a response.”

That degradation could ultimately leave Taiwan’s military weakened should one of China’s large-scale drills suddenly become the real deal, and with US aid to Taiwan “long-delayed and overdue,” Shattuck said, it could hamper Taiwan’s readiness.

“The median line of the Taiwan Strait—a de facto boundary that created some semblance of cross-Strait stability—is no more” and “Taiwan cannot push back on all fronts against these PRC incursions,” Lewis and Shattuck wrote recently.

This is an attritional fight, they said, arguing that while Chinese military activities around Taiwan “have become normalized and are a part of the ever-deteriorating status quo in the Taiwan Strait,” Taipei and Washington still have cards to play.

Taiwan has spent years navigating tricky relations with Beijing, which is opposed to the ruling Democratic Progressive Party and has labeled Lai a “separatist.”

As the Chinese military continues its incursions in Taiwan’s ADIZ, Washington and its allies “need to remain vigilant in protesting these activities so that it is clear that military coercion of Taiwan is unacceptable,” Shattuck said.

“It is unrealistic to argue that Taiwan or the United States will be able to stop the PRC aerial and maritime incursions around Taiwan,” he and Lewis wrote, but there are options. “Washington,” they said, “should work to elevate Taiwan’s ability to track the situation around its territory and provide it with the necessary resources to push back as needed.”