According to the ship and plane spotting group Taiwan ADIZ, the Chinese coast guard vessel 2901 and three other ships transited in waters northeast of Taiwan on Saturday, where both the coast guards of Taiwan and Japan deployed their ships to monitor.

China again is sending planes and ships for military exercises around Taiwan. The self-ruled island condemned this "provocative act."

The drills were seen as a response to a speech by President Lai Ching-te of Taiwan, who said last week that China had “no right to represent” the island.