Iran's defense minister is visiting Moscow for talks about closer military cooperation with Russia.
Hossein Dehghan met with President Vladimir Putin on February 16 and held talks with his Russian counterpart Sergei Shoigu.
Shoigu hailed a "high level of mutual trust" between the two countries and their eagerness to coordinate policies.
Russia and Iran have both been strong backers of Syrian President Bashar al-Assad during the nearly five-year conflict in Syria.
Dehghan said in an interview with Russian state television that Tehran wants to expand military and technical ties with Moscow.
Russia has a contract with Iran to deliver long-range S-300 air defense missiles, and Tehran also has expressed interest in other Russian weaponry.
Dehghan revealed earlier this month that Tehran plans to ink a deal with Moscow for the purchase of Su-30 fighter jets.