National Security Council spokesman John Kirby told reporters that Iran has sent a "relatively small number" of personnel to Crimea, a part of Ukraine unilaterally annexed by Russia in contravention of international law in 2014, to assist Russian troops in launching Iranian-made drones against Ukraine."The information we have is that the Iranians have put trainers and tech support in Crimea, but it's the Russians who are doing the piloting," Kirby said.Declassified U.S. intelligence findings showed that Russians faced technical problems with the Iranian drones soon after taking delivery of the weapons in August."The systems themselves were suffering failures and not performing to the standards that apparently the customers expected," Kirby said.Among the individuals hit with asset freezes and travel bans by the British were Major General Mohammad Hossein Bagheri, chairman of the armed forces general staff overseeing the army branches supplying Russia with drones; Brigadier General Seyed Hojjatollah Qureishi, a key Iranian negotiator in the deal;."