WASHINGTON, June 9 (Reuters) - The White House said on Friday that Russia appeared to be deepening its defense cooperation with Iran and had received hundreds of one-way attack drones that it is using to strike Ukraine. "Russia has been using Iranian UAVs in recent weeks to strike Kyiv and terrorize the Ukrainian population, and the Russia-Iran military partnership appears to be deepening," White House spokesman John Kirby said in a statement. "We will continue to impose sanctions on the actors involved in the transfer of Iranian military equipment to Russia for use in Ukraine," Kirby said