Biden warns Putin of 'strong measures' amid Ukraine invasion fears

The US says it is preparing "robust responses" over fears of a Russian invasion of Ukraine, after President Biden's rare talks with Vladimir Putin.

In a video link, Mr Biden voiced deep concerns over Russian troop build-ups and threatened "strong economic and other measures", Washington said.

Russia says it will not attack Ukraine.

Mr Putin accused Kyiv of provocation, and sought guarantees against eastward Nato expansion and deployment of offensive weapons close to Russia.