Moscow pulled out of the yearlong agreement, a rare accord between Russia and Ukraine brokered by Turkey and the United Nations. Efforts to revive it have been plunged into doubt, as Russia has pummeled Ukrainian ports, striking grain stores and other infrastructure, and has vowed it will treat commercial ships in the Black Sea as potentially carrying military cargo.
“Due to Russia’s actions, the world is once again on the brink of a food crisis,” Mr. Zelensky wrote on Twitter late Friday. “A total of 400 million people in many countries of Africa and Asia are at risk of starvation. Together, we must avert a global food crisis.”
Turkey’s president, Recep Tayyip Erdogan, has been a key mediator between Russia and Ukraine since the full-scale invasion began last February, standing out from his NATO allies by keeping up friendly relations with President Vladimir V. Putin of Russia. Mr. Erdogan is expected to meet with Mr. Putin next month.