Russian President Vladimir Putin and German Chancellor Angela Merkel had a telephone conversation on December 7.
The Kremlin's press service spread the information, Report says.
The two countries' leaders stressed the importance of resolving the problem of war victims in Nagorno-Karabakh. They also discussed Russia's efforts to stop military operations and the activities of peacekeepers in Karabakh.
Putin and Merkel also pointed to the need to involve international experts in the humanitarian center's work.