Biden has committed tens of billions of dollars to Kyiv's war effort, and at the weekend he reportedly ditched a long-standing red line on Ukraine's use of American weaponry to launch attacks deep into Russia. Donald Trump Jr tweeted that the president was trying to "get World War Three going" before his father took office.

Xi's remarks come after Trump tapped Taiwan supporters Marco Rubio and Mike Waltz for top spots in his administration.

When President Joe Biden worked to burnish his climate legacy in the Brazilian Amazon on Sunday, the unspoken presence of Donald Trump shadowed the historic stop.

Ukraine's President Zelensky reacts to the US decision by saying "such things are not announced. Missiles will speak for themselves".

"Stop playing by rules that no longer exist. At this point, it's not just spinelessness, it's complicity," the president-elect's estranged niece said.

Joe Biden wandered into the Amazon rainforest after giving a speech warning of the dangers of climate change. Wearing an open-necked blue shirt, dark slacks and his trademark Aviator sunglasses, the 81-year-old outgoing US president turned away from the podium and ambled into greenery.

The Biden administration is working against the clock to try to preserve at least some of the outgoing president’s legacy before Trump takes office.

The Amazon, which is about the size of Australia, stores huge amounts of the world's carbon dioxide, a greenhouse gas that drives climate change.

President Joe Biden met with Chinese President Xi Jinping on the sidelines of the APEC conference in Lima, Peru -- their last meeting of Biden’s presidency.