The US is seeking to broker a ceasefire in the full-scale war with Ukraine, which is now into its fourth year.
On Tuesday the White House said the two sides had agreed to a limited truce in the Black Sea. But Russia then put forward a list of conditions including the lifting of some Western sanctions, prompting concerns that Moscow was trying to derail any moves towards a ceasefire.
Martin Griffiths, a former United Nations official who has direct experience of negotiating with both Ukraine and Russia, gives his take on how the peace talks are going, and shares his advice on how the Americans could improve their strategy.
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