Iranian President Hassan Rouhani extended condolences to his Russian counterpart Vladimir Putin over Russian plane crash in Black Sea.
In his message, Rouhani expressed sorrow over the incident which led to killing a number of Russian citizens.
Russia has found the main flight recorder from a plane that crashed into the Black Sea killing all 92 on board, Russian Defense Ministry said on Tuesday.
The recorder, one of several reported to be on board, contains information that could help investigators identify the cause of Sunday's crash, which killed dozens.
Investigators have so far said that pilot error or a technical fault are most likely to have caused the Tupolev-154 to crash into the sea.