Joe Biden meets Chinese president Xi Jinping for the last time as U.S. president on Saturday, but the leaders' goal of lowering tensions before Donald Trump's inauguration is challenged by fresh conflicts over cyber crime,

Both have maintained a constant power struggle over the past three years as Beijing's ambitions and military muscle have grown.The first face-to-face meeting between the current leaders of the two main world powers was long-awaited because one of them was confined at home amid the harsh pandemic restrictions.

US President Joe Biden and Chinese counterpart Xi Jinping will meet for the last time Saturday, a day after both leaders warned of turbulent times ahead for the world as