FILE - in this file photo taken on Thursday, July 2, 2009, the Russian nuclear submarine, Yuri Dolgoruky, is seen during sea trials near Arkhangelsk, Russia. The Russian navy said in a statement Friday March 31, 2017, that its submarines have increased combat patrols to the level last seen during the Cold War. (AP Photo/Alexander Zemlianichenko, File)
Featured Photo Galleries
