The limited ceasefire in Ukraine: what has been agreed and how will it work?

As delegations from Moscow and Kyiv prepare to meet US negotiators in Riyadh, details of pact remain unclear Ukraine and Russia have agreed in principle to a limited ceasefire after the US president, Donald Trump, spoke with the countries' leaders last week. But uncertainty remains about how or when the part-ceasefire will take effect as Ukraine and Russia prepare to send delegations to Riyadh this week for parallel talks with the US.