Biden warns Putin with sanctions as West steps up Ukraine defences

US President Joe Biden said on Tuesday he would consider personal sanctions on President Vladimir Putin if Russia invades Ukraine, as Western leaders stepped up military preparations and made plans to shield Europe from a potential energy supply shock.

The rare sanctions threat came as Nato places forces on standby and reinforces eastern Europe with more ships and fighter jets in response to Russia's troop build-up near its border with Ukraine.

Russia denies planning an attack and said the crisis is...