Why Russia and China Fear America’s P-8 Poseidon Submarine Killer

National Interest – The P-8A Poseidon maritime patrol plane may not be as sexy as an F-35 stealth fighter, but in some ways it is far closer to the forefront of international flashpoints in the Pacific Ocean. Maritime patrol planes are essential for tracking the movement of ships and especially submarines across vast oceanic waters—and potentially sinking them in the event of hostilities.