The family of one of the two British fighters sentenced to death in a brief court appearance last week said on Saturday they were "devastated and saddened at the outcome of the illegal show trial" and called for Shaun Pinner to be treated as a prisoner of war and released or exchanged.
The conflict between the neighbours - two of the world's biggest grain exporters - has reverberated well beyond Ukraine.
"If due to Russian blockades, we are unable to export our foodstuffs, which is so sorely missing in global markets, the world will face an acute and severe food crisis and famine - famine in many countries of Asia and Africa," Zelenskiy told the Shangri-La Dialogue conference in Singapore.