BBC Russian learns a senior official in Russia's FSB security service is a suspect in the MH17 case.Read more
Thousands of people have gone missing since the conflict started in 2014, according to the Red Cross.
Wanted Russian rebel Igor Girkin scorned the MH17 trial, in a BBC interview. He is among four accused over the 2014 plane disaster, in which 298 people died.
Russia says the MH17 case has been fixed by the West for political reasons. Foreign ministry spokeswoman Maria Zakharova also accused the BBC of "propaganda".
Dozens of prisoners have been exchanged in the latest effort to ease the conflict in Eastern Ukraine.