The variant Iran allegedly sent to Russia is a tactical battlefield weapon not meant for strikes deep inside Ukraine.
Western powers on Tuesday announced fresh sanctions on Iran for supplying Russia with short-range missiles for imminent use against Ukraine, calling it a dangerous escalation of the conflict that threatened European security.
Russia and Iran are both already under international sanctions that restrict trade, but they have forged strong ties in various sectors, including military cooperation.
Russia has cultivated closer ties with Iran and other states hostile towards the United States, such as North Korea, in the two and a half years since the start of the Ukraine war.