Western powers will raise alarm Wednesday at a UN Security Council session over Russia’s attacks in Ukraine with purported Iranian drones, as the European Union prepared sanctions. The United States, France and Britain requested the discussion, which will take place behind closed doors at the Security Council, diplomats said. Russia holds veto power at the Security Council and would be sure to kill any resolution. But the United States and France have warned that Iran is violating a Security Council resolution by arming Russia in its war in Ukraine. Ukraine has for weeks reported attacks by Russia with Iranian Shahed-136 drones — unmanned aircraft whose warheads explode in kamikaze landings — and has moved to cut relations with Tehran. Iran and Russia have both denied the use of the drones, with Tehran saying it wants talks with Ukraine. But the European Union said Wednesday it had confirmed that Iran has supplied the drones to Russia. The Ukrainian military said Wednesday that it had shot down more than 220 Iranian-made drones in little more than a month, although a drone bombardment on the capital Kyiv on Monday left five people dead. Nabila Massrali, spokeswoman for EU foreign policy chief Josep Borrell, said that the bloc had “gathered our own evidence” and would prepare “a clear, swift and firm EU response.” EU diplomats told AFP there was work under way on Wednesday to draw up a list of Iranian individuals and entities linked to the drones who would be added to the bloc’s sanctions blacklist. The United States has charged that the drones, formally known as unmanned aerial vehicles (UAVs), violated UN Security Council Resolution 2231 of 2015 that blessed a now moribund nuclear deal. The resolution’s ban on Iran’s conventional arms sales expired in 2020, despite attempts by the then-US administration of Donald Trump. But the resolution still bans through October 2023 any transfers that could benefit nuclear-capable ballistic missiles unless there is permission from the Security Council. “Iran’s supply of these specific types of UAVs to Russia is a violation of UN Security Council Resolution 2231, and it is an issue for the UN Security Council,” State Department spokesman Vedant Patel said Wednesday. The alleged arms transfers come as Iran is facing growing pressure over its crackdown on the biggest protests in years, which were sparked by the death of Mahsa Amini, a 22-year-old detained by the clerical state’s notorious “morality police.” The unrest has led to new Western sanctions over human rights and put on the backburner efforts by US President Joe Biden to restore the 2015 nuclear deal, from which Trump pulled the United States. Western officials have highlighted the Iranian drones as evidence that Russia, historically one of the world’s largest arms exporters, has seen its arsenal badly depleted from losses on the battlefield.