As many observers of the Russo-Ukrainian War are awaiting the possible debut of Iranian drones with the Russian Armed Forces, relatively few know that Iranian-made and Iranian-procured armament is already in active use on the battlefields of Ukraine since at least April 2022. Rather than being used by the Russian Army, these weapons systems are deployed by Ukrainian forces in their fight against the Russian Army. The story of how these weapons ended up in Ukraine is perhaps just as fascinating as the fact of their actual presence in Ukraine, and requires us to first delve into the topic of Iranian arms trafficking to Yemen and the efforts of Western countries to combat it.