United States President Joe Biden said Monday the US military would intervene if China tried to annex Taiwan forcibly.

"That is the commitment we made," Biden said at a joint press conference with Japanese Prime Minister Fumio Kishida in Tokyo.

"We agree with a One-China policy. We have signed on to it and all the intended agreements made from there. But the idea that, that it can be taken by force, just taken by force, is just not appropriate," he said.