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The United States (US) 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.
Taiwan's defence ministry said Chinese ships and planes carried out missions in the Taiwan Strait over the weekend, with some crossing the median line - an unofficial buffer separating the two sides.
The Taiwan military said it responded "appropriately" to the live-fire exercises, which it described as a simulated attack on the island, by dispatching multiple aircraft and ships on Sunday morning, Reuters news agency reports.
Source: BBC
