 They said Iran is Russia's top military supporter. Iran has become Russia's top military backer in its war against Ukraine, according to U.S. Intelligence and National Security Council spokesperson John Kirby. Russia has been using Iranian drones to strike energy infrastructure, depriving millions of Ukrainians of power, heat and critical services. People in Ukraine today are actually dying as a result of Iran's actions, Kirby said on Friday. The U.S. official also highlighted the Russia-Iran partnership in weapons development and training. He warned that Russia might provide Iran with advanced military components, including helicopters and air defense systems. Similar concerns were voiced by U.K. Foreign Secretary James Cleverly, who described the Iran-Moscow military tries as a threat to global security. Stressing the delivery of hundreds of Iranian drones to Russia, Cleverly said that Iran had become one of Russia's main military supporters. Ukraine and Iran have been in a political role over Russia's use of uranium coming at the drones in its deadly airstrikes across the country on 17 October. Ukrainian President Volodymyr Sileskiy has said that around 10 Iranian drones were being shot down in his country per day.