Taiwan says China can blockade its key harbours, warns of 'grave' threat

China's armed forces are capable of blockading Taiwan's key harbours and airports, the island's defence ministry said on Tuesday, offering its latest assessment of what it describes as a "grave" military threat posed by its giant neighbour.

China has never renounced the use of force to bring democratic Taiwan under its control and has been ramping up military activity around the island, including repeatedly flying warplanes into Taiwan's air defence zone...