Russia launched fresh attacks with Iranian-made drones early Saturday over Ukraine, where the country’s southern command said it shot down 10 of the unmanned aerial systems, an indication that Moscow has replenished its supply of the drones as the two countries move toward what the U.S. has called a full defense partnership.

Ukraine’s southern command said it shot down four Shahed-136 drones in the Kherson region, four more in the Mykolaiv region and two in the Odessa region.