Russia on Saturday suspended participation in a U.N.-brokered Black Sea grain deal after what it said was a major Ukrainian drone attack on its fleet in Crimea, dealing a blow to attempts to ease the global food crisis.

U.S. President Joe Biden denounced the move as "purely outrageous" and said it would increase starvation.

Russia's defense ministry said Ukraine attacked the Black Sea Fleet near Sevastopol on the annexed Crimean peninsula with 16 drones early on Saturday, and that British navy "specialists" had helped coordinate the "terrorist" attack.