sophisticated weaponry is helping ukraine challenge for key cities, in the south and the east. us presidentjoe biden and china s president xijinping held a phone call today, and there were warnings and assurances about the us position on taiwan. taiwan is an island off china s south east coast. it behaves like an independent state but beijing considers it part of china, and says it will re take it, by force if necessary. there have been tensions between the us and china over that possibility. and today, xijinping told joe biden that the us should abide by the 0ne china principle with regard to taiwan according to chinese state media. with regard to taiwan and president xi said: those who play with fire will only get burnt. joe biden responded that on taiwan. the us policy has not changed. let s remind ourselves what this is all about. back in may, this happened. are you willing to get involved militarily to defend taiwan, if it comes to that? yes. you are? that s t