Major prisoner swap between Russia and Ukraine: Trump

"A major prisoners swap was just completed between Russia and Ukraine," Trump said on the Truth Social platform on Friday.

He said it would "go into effect shortly", although it was not clear what that meant.

A senior Ukrainian official familiar with the details of the swap said the exchange was ongoing on Friday morning and had not finished. 

He spoke on condition of anonymity because he was not authorised to speak publicly.

"This could lead to something big???" Trump added in his post, apparently referring to international diplomatic efforts to stop the fighting.

White House and National Security Council officials did not immediately respond to requests for further details.

The exchange was agreed last week in the first direct Russia-Ukraine peace talks since the early weeks of Moscow's 2022 invasion of its neighbor. 

That meeting in Turkey lasted just two hours and brought no breakthrough in international diplomatic efforts to stop the fighting.