The United States has accused Beijing of "provocative" and "irresponsible" actions after Taiwan said China rehearsed an attack on the island.
Taiwan said it responded to the Chinese drills, now in their fourth day, by deploying aircraft and ships on Sunday.
The heightened tensions follow a trip to Taiwan by a US delegation led by senior Democrat Nancy Pelosi.
China views the visit as a challenge to its claims of sovereignty over Taiwan, which sees itself as distinct.
Speaking to reporters in Taipei, premier Su Tseng-chang accused China of "arrogantly" using the exercises to disrupt regional stability and appealed for restraint from the Chinese side.
US Secretary of State Antony Blinken accused China of taking "irresponsible steps" by blocking key communication channels with Washington.
The island has its own constitution, democratically elected leaders, and about 300,000 active troops in its armed forces. »