Joe Biden warned Moscow that it faced "robust and meaningful" consequences if it engaged "in harmful activities."
David Frost, Britain's Brexit Minister, called on the EU to show "common sense" while the EU says the UK's threat to unilaterally extend a waiver on border checks will be met with repercussions.
But new infections fuelled by a new virus variant are on the rise.
Is there any substance to the UK's railway reform?
UK health minister Matt Hancock has been defending himself after a blistering attack from the prime minister's former chief aide Dominic Cummings.
An expert has questioned Dominic Cummings' reliability as a witness after his blistering attack on the UK government's handling of the COVID-19 pandemic.