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.
The UK, together with the US, has also sanctioned a number of key individuals and organisations for their involvement in Iran's military support for Russia, particularly those involved in ballistic missile and drone supply networks.