Born in Ukraine, Kirill Stremousov had switched to Russia's side and mimicked its claims about Nazi rule, becoming spokesman and deputy governor of the Moscow-installed administration in Kherson.
Russia, which had suspended participation over the weekend, says the grain deal is back on after assurances that shipping corridors would not be used for military purposes.
Sixty percent of Ukrainians who fled their homes for other parts of the country have lost their jobs, as Russia's invasion has upended industries and destroyed businesses.
Countries are scrambling to salvage a deal allowing Ukraine to export grain, after Russia said it pulled out indefinitely, a decision that risks worsening global hunger.
Ukrainian forces have made significant gains in recent weeks, recapturing wide swaths of territory in the east and northeast. Now they're bracing for what may be one of their toughest battles yet.
Russia's defense minister says the military reached its target of adding 300,000 troops to fight in Ukraine. The recruitment effort led many Russians to protest and flee the country.