The Kremlin said on Wednesday it was awaiting details from Washington about a proposal for a 30-day ceasefire in Ukraine, while senior Moscow sources said a deal would have to take account of Russia's advances and address its concerns.

Ukraine yesterday agreed to a temporary ceasefire with Russia after negotiators met in Saudi Arabia. The solution to this war and the way to end it and to achieve the president's objective of peace is to negotiate. But before you can negotiate, you have to stop shooting at each other.