This trade could threaten the US in Syria, which gives Iran four wins: Aiding Russia, Hezbollah and threatening the US and Israel.
A report said that European countries might ban sales to countries that appear to be aiding the program.
The appearance of the Yak in Iran is a major development in the region as it is confirmed a perception that Iran is on the cusp of increasing its military threats and capacity.
The news comes as Washington and Iran are trying to ease tensions and revive broader talks over Iran's nuclear program.
Russia issued a joint statement with the Gulf Cooperation Council in support of the UAE's initiative to reach a peaceful agreement on the three Gulf islands.
"We maintain that improving the bilateral defense relations will lead to increasing the Bolivian government's deterrence power," Ashtiani was quoted by the official news agency IRNA as saying.
Iran is looking forward to more exports and imports of missile technology in October when it expects certain sanctions to be lifted