The U.S. military has released footage of a mid-air encounter between a Russian fighter jet and a US drone that ended with the drone crashing into the Black Sea, raising tensions between the two countries. The U.S. has called on Russia to investigate the incident and take steps to prevent similar incidents in the future, while a senior Russian official has said Moscow would try to recover the wreckage of the drone. U.S. Army Gen. Mark Milley has said the unmanned aerial vehicle had likely broken during the crash and whatever debris was left likely sank to a depth of thousands of feet in the Black Sea.