Russian Foreign Minister Sergei Lavrov addresses permanent representatives to the Arab League in Cairo on July 24, 2022. AFP
"Ukraine today has 20 million tonnes of grain ready to be exported, principally to Arab and African states," Maksym Subkh told the pan-Arab bloc by video conference, saying "the siege of our ports by the Russian invaders" had blocked deliveries.
The increase in global food prices is "a direct result of Russian aggression", he added.
The Ukraine war has severely hampered grain supply from the country, leading to an international food crisis as it is one of the world's biggest producers.
Some ships have been able to leave Ukrainian ports in recent days after a deal with Russia brokered by the United Nations and Turkey.
Several members of the Arab League are heavily dependent on wheat imports from both Russia and Ukraine, and have been reeling from food insecurity since Moscow's invasion of its neighbour.
But while the United States has sought to isolate Russia on the global stage over the war, it has faced less success in the Arab world, where many countries are hesitant to strain relations with Moscow.
In late July, Russian Foreign Minister Sergei Lavrov praised Arab countries' and the League's "balanced, fair, responsible position" on not siding with either Russia or Ukraine.
Lavrov at the time said Western sanctions on Moscow had "aggravated" the global food crisis, but Subkh on Thursday called the measures "the only way of returning Russia to reason".
Subkh warned Arab countries against "Russian meddling in regional affairs", accusing Moscow of sending mercenaries to the region in order to plan "coups" and "plunder these countries' wealth".
He told the Arab League that his own appointment last month was "proof of Ukraine prioritising its political dialogue with Arab states".
Moscow ally Damascus, which was suspended from the pan-Arab bloc after civil conflict broke out in Syria in 2011, said in July that it was severing ties with Ukraine in support of Russia, saying the move was a response to a similar move by Kyiv.
Subkh said Thursday that Syria had tried to "legitimise Russia's illegal occupation" of Ukraine.