The European Union on Sunday called on Russia to reverse its decision to pull out of a UN-brokered grain deal.
Moscow suspended its participation in the Black Sea deal on Saturday, effectively cutting shipments from Ukraine, one of the world's top grain exporters, in response to what it called a major Ukrainian drone attack earlier in the day on its fleet near the port of Sevastopol in Russian-annexed Crimea.
"Russia's decision to suspend participation in the Black Sea deal puts at risk the main export route of much needed grain and fertilizers to address the global food crisis caused by its war against Ukraine," EU foreign policy chief Josep Borrell said on Twitter.
"The EU urges Russia to (reverse) its decision."
Russia's defense ministry said Ukraine attacked the Black Sea Fleet near Sevastopol with 16 drones early on Saturday, and that British navy "specialists" had helped coordinate what it called a terrorist attack.
Russia said it had repelled the attack but that the ships targeted were involved in ensuring the grain corridor out of Ukraine's Black Sea ports.
Russia told UN Secretary General Antonio Guterres on Saturday in a letter, seen by Reuters, that it was suspending the deal for an "indefinite term" because it could not "guarantee safety of civilian ships" travelling under the pact.
Moscow asked the UN Security Council to meet on Monday to discuss the Sevastopol attack, Deputy UN Ambassador Dmitry Polyanskiy wrote on Twitter.
More than 10 outbound and inbound vessels waited to enter the humanitarian corridor on Saturday and there was no agreement for the movement of vessels on Sunday, Amir Abdulla, the UN coordinator for the deal, said on Saturday.