ABU DHABI -- The delegations from the United States, Ukraine and Russia have agreed to exchange 314 prisoners -- the first such exchange in five months, US presidential special envoy Steve Witkoff said Thursday.

Witkoff said on social media platform X that the outcome was achieved from peace talks that have been "detailed and productive," emphasizing that "significant work" remains.

He added that discussions will continue, with additional progress anticipated in the coming weeks.

The second round of US-brokered talks between Russia and Ukraine started on Wednesday in Abu Dhabi and lasted for two days. It followed an initial round held in Abu Dhabi on Jan. 24, which concluded without any concrete agreements or a joint statement.