Ukraine has said it used sea drones to attack and destroy a Russian warship in the Black Sea near the Russian-annexed Crimean peninsula. The military intelligence agency, known by its Ukrainian acronym GUR, published a video on Thursday that it said depicted a naval drone attack on the missile-armed corvette Ivanovets the night before. The grainy footage, running about 2 and a half minutes and accompanied by a dramatic soundtrack, showed a number of explosions, and the ship eventually listing to one side. It ended with the vessel sinking stern-first into the sea. "As a result of a number of direct hits to the hull, the Russian ship suffered damage incompatible with further movement," the intelligence agency said in a statement accompanying the video, apparently made up of live feeds from the drones.

U.S. European Command on Thursday released video of a Russian Su-27 fighter jet colliding with a U.S. MQ-9 Reaper drone over the Black Sea, March 14. Russian vessels have already arrived at the drone crash site in the Black Sea, a U.S. defense official tells Fox News. Almost immediately after the MQ-9 drone was clipped by a Su-27 fighter jet and downed into the water, Russia sent ships to search the debris field. "They wasted no time," the defense official told Fox News. U.S. European Command on Thursday released video of a Russian Su-27 fighter jet colliding with a U.S. MQ-9 Reaper drone over the Black Sea, March 14.

Recovery of a US surveillance drone that crashed after being intercepted by Russian fighter jets would be challenging given the deep waters in the Black Sea, a senior United States general said, as reports emerged of Russian vessels at the crash site. Chairman of the US Joint Chiefs of Staff General Mark Milley said remains of the uncrewed MQ-9 Reaper drone, which the US claims was brought down by one of two Russian Su-27 jets clipping the drone's propeller, sank in waters as deep as 1,219 to 1,524 meters (4,000 to 5,000 feet). "It probably sank to some significant depths, so any recovery operation from a technical standpoint would be very difficult," Milley told reporters on Wednesday. Milley added it would take several days before the US would know for certain the size of the debris field. Moscow – which denies that its jets were in physical contact with the drone – said it would try to retrieve the drone wreckage as reports emerged on Thursday of US officials confirming that Russian ships had reached the crash site.