Ukraine has requested a meeting with Russia and all other signatories to the Vienna Document within 48 hours to discuss the situation around the movements of troops along the Ukrainian border.

"Russia failed to respond to our request under the Vienna Document. Consequently, we take the next step. We request a meeting with Russia and all participating states within 48 hours to discuss its reinforcement & redeployment along our border & in temporarily occupied Crimea," Ukrainian Foreign Minister Dmitry Kuleba wrote in a tweet on Sunday.