In this photo, taken from video distributed by Russian Defense Ministry Press Service on June 8, the motorcade of refrigerators of the first convoy carrying bodies of Ukrainian soldiers for repatriation is parked at an exchange area near Novaya Guta, Belarus, for the beginning of a large-scale exchange between Russia and Ukraine. (AP)

Russian officials say that Moscow is still awaiting confirmation from Kyiv on a planned exchange of 6,000 bodies of soldiers killed in action.

(Reuters) -Ukrainian President Volodymyr Zelenskiy vowed on Sunday to press on with prisoner exchanges with Russia and said any failure by Moscow to uphold humanitarian accords cast doubt over U.S. and other efforts to end the more than three-year-old conflict.