Russian Ministry for Emergency Situations provided Iran with satellite images of the crash scene of an ATR-72 passenger plane, the press service of the ministry said.
According to the reports, rescue workers have been dispatched to find and transfer the bodies of the victims.
In a message on his website, President Hassan Rouhani said he has assigned officials to investigate the case and apply measures to avoid similar incidents in future.
Following the deal, Aseman Airlines finalised an agreement to buy 30 Boeing 737 MAX jets for $3 billion (2.4 billion euros) last June, with an option to buy 30 more.
Aseman Airlines is owned by Iran's civil service pension foundation which is a public-private air carried headquartered in Tehran.
Steffen Seibert said the German government "shares the grief of the Iranian people for those who lost their lives".
"On a previous flight from Yasuj to Tehran in 2013 he had an issue where the second engine of the ATR72 went out", said the post. As well there were six crew members on the plane.
The Aseman Airlines passenger plane came down in the Zagros mountains on Sunday, and all those on board are feared to have been killed.
The plane that crashed on Sunday had been built in 1993, Aseman Airlines CEO Ali Abedzadeh told state TV.
Mount Dena is 1,440ft (440 metres) tall.
The ATR aircraft, a twin-engine turboprop typically used for short-distance regional flights, hit the Dena Mountains, the report said.
Preparations are under way for Russian President Vladimir Putin, Turkish President Tayyip Erdoğan and Iranian President Hassan Rouhani to meet in April in Turkey, RIA news agency said on February 19.
Despite some of its planes being prohibited from flying above Europe, Iran Air operates direct flights between London and Tehran, often using its much more modern A330s.
Aviation accidents are unfortunately not uncommon in Iran, due to its aging aircraft fleets, inability to acquire American-made spare parts due to sanctions, and what some say is a matter of mismanagement.