Russia says the ship's captain failed to respond to a request to halt for an inspection.

EU foreign policy chief says the EU will 'continue to support the tireless efforts' of the UN and Turkey to revive the Black Sea grain deal.

The meeting will take place at the level of ambassadors.

The UN has long argued that the Black Sea deal was a commercial operation and it had benefited poor states by helping lower food prices more than 23% globally since March last year.

The grain deal was welcomed by the United Nations and US, though both called for more certainty over the exports.

The G7 is reportedly discussing reversing its sanctions approach so that exports to Russia are automatically banned unless they are included on a designated list of products allowed to be shipped to the country.

Ukrainian Black Sea ports were blockaded after Russia's invasion last year, but access to three of them was cleared last July under a deal between Moscow and Kyiv that was brokered by the United Nations and Turkey.

Russia's state news agency says so far none of the involved sides has indicated a withdrawal.

The U-turn followed a phone call between Russian President Vladimir Putin and Turkish President Tayyip Erdogan, and repeated conversations between their defence ministers.

Moscow and Beijing are separately accusing Washington of provocative behaviour over Ukraine and Taiwan.