Russia has destroyed almost 300,000 metric tons of grain since July in attacks on Ukraine’s port facilities and on ships, the Ukrainian government said on Friday, underscoring the war’s threat to global food security.

In summer, Moscow quit a U.N.-brokered deal that had allowed exports of Ukrainian grain through the Black Sea safely. Since then, Russian forces have hit six civilian ships and 150 port and grain facilities during 17 attacks, destroying crops headed for export, Deputy Prime Minister Oleksandr Kubrakov said in a statement.

“This is Russia’s attempt to deepen the food crisis in the countries which depend on Ukrainian products,” Kubrakov said.