Russia and Ukraine have reached a preliminary agreement to conduct another large-scale prisoner exchange following negotiations in Abu Dhabi, Russian Presidential Aide Vladimir Medinsky, who leads Moscow's delegation, has announced.

He stressed that humanitarian issues were discussed during the negotiations, The Caspian Post reports, citing TASS.

"We reached a fundamental agreement on another large-scale prisoner exchange. Details will be announced soon," Medinsky said following the trilateral talks between Russia, the United States and Ukraine in Abu Dhabi.