Iran has supported Russia both diplomatically and militarily since the beginning of the Russian invasion of Ukraine in February 2022. It has voted against United Nations resolutions condemning Russia and has regularly delivered loitering munitions, chiefly the Shahed 131 and Shahed 136, to the Russian military. Several countries have accused Iran of violating United Nations Security Council Resolution 2231, which was adopted with full support of the sitting members in July 2015 and seeks to inspect the Iranian nuclear program in preparation for ending United Nations sanctions against Iran. Additionally, Ukraine and the United States, among others, have stated that Iran's Islamic Revolutionary Guard Corps (IRGC) has had a presence in Russian-occupied Crimea for the purpose of operating Shahed drones in attacks against Ukrainian cities. Some of these IRGC personnel have reportedly been killed by Ukrainian military strikes against Russian-occupied territory; the Iranian involvement in Russia's invasion has negatively impacted Iran–Ukraine relations while intensifying existing tensions between Iran and the United States.