LVIV, Ukraine — As a potential power broker, Turkish President Recep Tayyip Erdogan will use his first visit to Ukraine since the war started nearly six months ago to seek ways to expand the export of grain from Europe’s breadbasket to the world’s needy while U.N. Secretary-General António Guterres will focus on containing the volatile situation at a Russian-occupied nuclear power plant.

Ukrainian President Volodymyr Zelenskyy is hosting both men far away from the front lines, in the western city of Lviv, where diplomatic efforts to help end the war will also be on the agenda. Ukrainian authorities said that Russian forces killed at least seven in more shelling in and around Ukraine’s second-largest city Kharkiv.

Erdogan, whose nation is a member of NATO which backs Ukraine in the war, also oversees a wobbly economy that has been increasingly reliant on Russia for trade. That backdrop turns Thursday’s meetings in Lviv into a walk on a diplomatic tightrope. Earlier this month, the Turkish leader met on the same issues with Russian President Vladimir Putin.

Erdogan is set to have a one-hour meeting with Zelenskyy in the early afternoon before both are joined by Guterres.

Last month, Turkey and the U.N. helped broker an agreement clearing the way for Ukraine to export 22 million tons of corn and other grain stuck in its Black Sea ports since Russia invaded Feb. 24. A separate memorandum between Russia and the U.N. aimed to clear roadblocks to shipments of Russian food and fertilizer to world markets.

The war and the blocked exports significantly exacerbated the global food crisis because Ukraine and Russia are major suppliers. Turkey is in a position to help speed up exports, which have been reduced to a trickle so far.

Grain prices peaked after Russia’s invasion, and while some have since returned to prewar levels, they remain significantly higher than before the COVID-19 pandemic.

Developing countries have been hit particularly hard by supply shortages and high prices. Even though ships are now leaving Russia and Ukraine, the food crisis hasn’t ended.

U.N. spokesman Stephane Dujarric told reporters this week that Guterres’ trip to Ukraine will allow him “to see first-hand the results of an initiative … that is so critically important to hundreds of millions of people.”

He said the three leaders will also discuss the situation at the Russian-controlled Zaporizhzhia nuclear power plant in southern Ukraine, Europe’s largest, which Moscow and Kyiv have accused each other of shelling.

In his nightly video address Wednesday, Zelensky reaffirmed his demand for the Russian military to leave the plant, emphasizing that “only absolute transparency and control of the situation at and around the Zaporizhzhia nuclear power plant for the Ukrainian state, for the international community, and for the IAEA can guarantee a gradual return to normal nuclear safety.” The International Atomic Energy Agency is a U.N. agency. Russia has rejected the demand.

If grain transports and nuclear security are issues where some progress could be made, talks about an overall end to the conflict weren’t expected to yield anything substantive.

In March, Turkey hosted a round of talks between Russian and Ukrainian negotiators, who discussed a possible deal to end the hostilities. The talks fell apart after the meeting in Istanbul, with both sides blaming each other.

Erdogan has engaged in a delicate balancing act, maintaining good relations with both Russia and Ukraine. Turkey has provided Ukraine with drones, which played a significant role in deterring a Russian advance early in the conflict, but it has refrained from joining Western sanctions against Russia over the war.

Facing a major economic crisis with official inflation near 80%, Turkey increasingly relies on Russia for trade and tourism. Russian gas covers 45% of Turkish energy needs, and Russia’s atomic agency is building Turkey’s first nuclear power plant.

During their meeting in Sochi this month, Putin and Erdogan agreed to bolster energy, financial and other ties between their countries, raising concerns in the West that Ankara could help Moscow bypass the U.S. and European Union sanctions.