From Al-Jazeera:

China has stepped up military activity around the island, where the losing nationalists set up their government at the end of the civil war in 1949, sending fighter jets and warships on exercises close to Taiwan. Communist-ruled China claims the island as its own and has not ruled out the use of force to assert its control.
Taiwan’s defence ministry, in a statement late on Thursday to accompany a video showing Taiwanese forces taking part in drills, said it was “expressing its stern attitude about recent Chinese Communist People’s Liberation Army military pressure acts”.