USA Today reports that “Chinese and Russian warplanes have been increasingly aggressive intercepting U.S. military aircraft and patrolling near America’s West Coast, prompting the Air Force’s top combat officer to label their provocations one of his top worries.”  

“Air Force Gen. Herbert ‘Hawk’ Carlisle, who leads Air Combat Command, said in an interview with USA TODAY that meeting the challenge from the Russian and Chinese to flights in international airspace is essential but dangerous.”  

“’Our concern is a resurgent Russia and a very, very aggressive China,’ Carlisle said.”