The six-week conflict over Nagorno-Karabakh was brought to a halt in November by a Russian-brokered ceasefire agreement under which Azeri and ethnic Armenian forces were expected to exchange all captives.
Armenia has said that many of its prisoners of war remain in Azerbaijan, a problem it has raised with the co-chairs of the OSCE Minsk group.
Lavrov said that Armenia did not immediately present a full list of captives it sought, which slowed down the process. Azerbaijan has received all the people it sought, he added.He said Russian peacekeepers deployed to the region were in contact with Armenian and Azeri forces to establish the location of those named by Armenia.