The Kremlin said on Wednesday it was awaiting details from Washington about a proposal for a 30-day ceasefire in Ukraine before responding, while U.S. Secretary of State Marco Rubio hoped a deal would be struck within days.

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.

While both countries claim they want peace, there's previously been significant differences between what Kyiv and Moscow have said they'd be prepared to agree to, and there's still plenty that needs to happen before fighting stops.