The Black Sea ceasefire was discussed in Saudi Arabia during parallel US talks with Ukrainian and Russian officials. Despite Russia entering those talks saying its main objective was to broker such a truce, Kyiv said it was effective immediately once the talks concluded, while Russia sought to impose further conditions on the agreement.

Steve Witkoff held talks with the Russian president, meanwhile Moscow's ambassador to the UK told the BBC the US is not Russia's ally.

Moscow and Kyiv agreed in principle last month to implement a limited, 30-day ceasefire but soon each issued conflicting statements.