US deeply concerned over Taiwan-China tension - BBC
The US is "deeply concerned" about actions that undermine peace across the Taiwan Strait, US national security adviser Jake Sullivan has told the BBC.
His comments come after China sent a "record number" of military jets into Taiwan's air defence zone for four days in a row, in a public show of force.
Taiwan considers itself a sovereign state - but China views the island as a breakaway province.
Beijing has not ruled out the possible use of force to achieve unification.