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.