"The Japanese F-35 fighter jet missing in the Pacific could be a major security headache for the U.S. if Russia or China locate the state-of-the-art fighter jet first, experts warn.
Japanese defense officials say a search is underway for the fighter jet after it disappeared from radar during a flight exercise in northern Japan. The plane’s pilot is also missing."
Note the comment "The pilot is also missing" I'm afraid that the aircraft is now sitting on a Russian or Chinese base right now be taken apart by their scientists. This type of technology should not be supplied to any air Force other than the US Air Force. no allied personnel shouldbe allowed anywhere near it.
If the Russians or Chinese have it the aircraft moves from almost unbeatable to a sitting duck . (Just my personal opinion. )