<span style="color: #222222;">US President Joe Biden has said that he would be willing to use force to defend Taiwan if it is attacked. He was answering questions in Tokyo during a press conference with Japanese PM Fumio Kishida, when a journalist asked them about the defence of Taiwan.<br />''<br />''Referring to increasing reports of Chinese warplane incursions into Taiwan's self-declared air defence zone, Mr Biden said, they are already flirting with danger right now by flying so close.<br />''<br />''China considers the democratic island its territory, under its one-China policy, and says it is the most sensitive and important issue in its relationship with Washington. </span><br />