Ukraine has called for a meeting with Russia and other members of a key European security group over the escalating tensions on its border.
Foreign Minister Dmytro Kuleba said Russia had ignored formal requests to explain the build-up of troops.
He said the next step was requesting a meeting within the next 48 hours for transparency about Russia’s plans.
Meanwhile, UK Prime Minister Boris Johnson plans to hold fresh diplomatic talks across Europe to bring Russia “back from the brink” of war.