China’s military has unilaterally set up what Taiwan’s ministry of defense described as a “live-fire” training zone about 46 miles off the southwestern coast of the island.

Taipei’s defense ministry said on Wednesday it detected 32 Chinese military aircraft, 22 of which crossed the median line of the Taiwan Strait and entered the island’s Air Defense Identification Zone (ADIZ), or the airspace where countries identify, locate, and control aircraft.

“The [People’s Liberation Army] has blatantly violated international norms by unilaterally designating a drill zone 40 [nautical miles] off the coast of Kaohsiung and Pingtung, claiming to conduct live-fire exercises without prior warning,” the ministry said.

The Chinese Communist Party, which has led the country for about 75 years, claims Taiwan is one of its territories, though it does not govern the island and never has. Chinese leaders have warned that they have the long-term intent to reunify the two, even if it takes military force.

While the U.S. is legally required to arm Taiwan, it maintains “strategic ambiguity” when it comes to whether it would deploy its military to defend Taiwan from a Chinese attack over several administrations.

China’s military has become more aggressive toward Taiwan in recent years while simultaneously expanding and modernizing its capabilities.

On Tuesday, Taiwanese authorities detained a cargo ship that was accused of severing an undersea communications cable that connected Taiwan to the Penghu Islands, which lies about 30 miles west of the main island.

According to the Taiwanese Coast Guard Administration, the ship’s crew consisted entirely of Chinese nationals, and the ship was financially backed by China. The Administration also noted that it’s unclear whether the incident was deliberate or accidental.

“It cannot be ruled out that it was a gray area intrusion operation by China,” the Coast Guard said.

Undersea cables date back to the 1850s and involve the invention of the telegram. Now, nearly 200 years later, there are nearly 750,000 miles of these cables under various bodies of water across the globe, which the world relies on for internet access, e-commerce, and entertainment.

CHINA-TAIWAN FEUD RUNS DEEPS IN SOUTH AFRICAN POLITICS

Several cables off of Taiwan’s coasts, as well as in the Baltic Sea, have been cut in recent years, raising suspicions that Russia and China could be deploying cargo ships or oil tankers to target them deliberately. The cables are often cut via the inexact science of dragging anchors across the floor of the body of water.