US President Joe Biden and British Prime Minister Boris Johnson have spoken on the phone about Ukraine.

Despite repeated warnings of possible Russian military action, Biden and Johnson agreed that the diplomatic solution is still possible. The British prime minister has said he is ready to do anything to help Biden in the crisis. Biden also vowed not to do anything without British help.

On Monday, Russia’s foreign minister also said “we are not tired of diplomacy.” Despite gathering more than 100,000 troops on the Ukrainian side of the border, Moscow has denied any involvement in the attack.