Ukrainian prisoners of war (POWs) are seen after a swap at an unknown location in Ukraine, in this handout picture released May 23, 2025. (Photo: Reuters)

The agreement to exchange 1,000 prisoners each was the only concrete step towards peace to emerge last week from the first direct talks between the warring sides in more than three years, when they failed to agree a ceasefire.

Both sides said they had each released 270 soldiers and 120 civilians so far, with more due to be released on Saturday and Sunday.

Referring to the prisoner swap earlier on Friday, US President Donald Trump, who had pressed the sides to meet last week, wrote on Truth Social: "Congratulations to both sides on this negotiation. This could lead to something big”.