Guterres first proposed the grain deal to Russian President Vladimir Putin and Ukraine's Zelinskyy at separate meetings in Moscow and Kyiv in late April. The UN's Dujarric said the secretary-general's trip to Ukraine is “a chance for him just to see first-hand the results of an initiative … that is so critically important to hundreds of millions of people.” After the three-way meeting, and likely bilateral talks between Erdogan and Guterres, the UN chief will travel to Odesa, one of the three Ukrainian ports now operating to ship grain, on Friday, Dujarric said. He will then travel to Istanbul on Saturday to visit the center coordinating the Black Sea shipping, which includes the four parties to the deal -- Ukraine, Russia, Turkey and the United Nations.