Changes to Russia's nuclear doctrine have been drawn up and will be formalised as necessary, the Kremlin said on Tuesday, signalling again Moscow's concern over the latest U.S. decision on missile strikes from Ukraine.

President Biden's decision to allow Ukraine to fire U.S.-made and supplied missiles deeper into Russia — a major policy shift announced over the weekend after months of intense lobbying by Kyiv — has drawn a furious response from Moscow.

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.

Joe Biden will put a bow on his environmental legacy Sunday, becoming the first sitting U.S. president to visit the Amazon — a gesture of solidarity with global efforts to confront the looming catastrophe of climate change.