Istanbul - (AFP) - Three new cargo ships loaded with grain left Ukrainian ports on Tuesday morning, heading for the humanitarian corridor in the Black Sea, according to the Joint Coordination Center in Istanbul.

"The delegations of Ukraine, Turkey and the United Nations approved the movement of these ships on Tuesday. The Russian delegation was informed of it," the center told AFP.

The center in Istanbul supervises Ukrainian grain exports under an international agreement signed last July, and Russia announced its temporary withdrawal from it a few days ago.

Russia, which announced on Friday that it had suspended its "participation" in the agreement, warned Monday of the "danger" of continuing navigation in the corridor without its consent.

Moscow, which condemned the strikes by the marchers on its fleet in Crimea, demanded that Ukraine "ensure security" in the sea lane.

Turkey and the United Nations are making efforts to remove Russian objections.

"The United Nations coordinator of the Black Sea Grain Initiative, Amir Abdullah, continues his talks with the countries parties to the agreement in order to resume their full participation in the center," the center said.

The Russian delegation announced on Saturday that it would no longer participate in the inspection of ships.

The center stated that despite the withdrawal of the Russian inspectors, 46 ships were inspected on Monday and can therefore cross the passage in the Red Sea in both directions.

The Turkish defense and foreign ministers held talks with their Russian counterparts, stressing the importance of this corridor for the transportation of grain.

The international agreement, which expires on November 19, aims to allow the export of Ukrainian grain to avoid a serious food crisis in Africa, in particular.