Article plus photo on the
BBC News website.
Taiwan has reported a large incursion by Chinese warplanes for the second day running, a show of force that coincides with the first days of US President Joe Biden's term of office.
Sunday's operation involved 15 aircraft and happened a day after a similar drill led to a warning from Washington.
China sees democratic Taiwan as a breakaway province but Taiwan's leaders argue that it is a sovereign state.
Analysts say China is testing the level of support of Mr Biden for Taiwan.