The conversation between Mr Zelensky and Ethiopia's Prime Minister Abiy Ahmed took place in the wake of Russia's withdrawal from a deal that allowed for the safe exporting of Ukrainian grain.

There have been concerns over the impact of this decision on food security in poorer countries.

"I informed the interlocutor that Ukraine has supplied almost 300,000 tonnes of food to Ethiopia under the Black Sea Grain Initiative and another 90,000 tonnes of grain under a separate Grain From Ukraine initiative," the Ukrainian president said in his tweet.

"I emphasised that Ukraine is still ready to remain a guarantor of global food security."

Mr Abiy's tweet about the phone call was more terse.

He wrote: "I held a phone call with President Zelensky today to discuss bilateral and international matters of mutual interest as well as the means and ways of bringing peace between Ukraine and Russia."