Russian Foreign Minister Sergei Lavrov said on Friday that Moscow is ready to negotiate with Ukraine and Turkey about grain exports but it is unclear when such talks might take place.

U.S. and Western officials have said that Russia has effectively blockaded Ukrainian ports and exerted tight control on Ukraine’s grain exports. The Kremlin has said that Kyiv is free to ship grain from its ports. Turkey and the United Nations have been leading efforts to transport Ukrainian grain out of the country.