Guterres first proposed the grain deal to Russian President Vladimir Putin and Ukraine's Zelenskyy at separate meetings in Moscow and Kyiv in late April. The U.N.'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 centre co-ordinating the Black Sea shipping, which includes the four parties to the deal -- Ukraine, Russia, Turkey and the United Nations.
Russia was not invited by Zelenskyy to the meeting in Lviv.
Dujarric said the secretary-general had "a very good conversation" Monday with Russian Defense Minister Sergei Shoigu, which touched on the grain shipments from both Ukraine and Russia.
During the phone call, Guterres and Shoigu also discussed "the conditions for the safety operations of the Zaporizhzhia nuclear power plant" and a fact-finding mission to the Olenivka prison, Dujarric said.
The war and a halt to all Ukrainian grain shipments and most Russian shipments of grain and fertiliser added significantly to the global food crisis because both countries are major suppliers to world markets.
Developing countries have been especially hard-hit by supply shortages and high prices. Even though ships are now leaving Russia and Ukraine and some prices have dropped, the food crisis has not ended.