China is clearly developing the capability to attack at some point, but deciding to do so would be a political choice, Gen Mark Milley told the BBC.
China says Taiwan is a breakaway province that must be re-unified with the mainland, by force if necessary.
It has accused the US of supporting Taiwan’s independence, and vowed to “resolutely crush” any such attempt.
There has been a marked escalation recently between China and the US – Taiwan’s most powerful ally.
China has been sending scores of warplanes into Taiwan’s air defence zone, while the US has sent naval ships through Taiwan’s waters.
Read more at BBC.com