U.S Considering Japanese Participation In F-35 Program

http://www.aero-news.net/index.cfm?contentBlockId=38d6317e-d635-4355-b629-ce4deb339b0c

Move Would Allow Japan To Acquire JSF On An Accelerated Basis

The U.S. government may allow Japan to assist in the development of
the F-35 Joint Strike Fighter, even though there is no assurance that
the Japanese government will procure the advanced aircraft. Their
continued participation means that Japan would at least be eligible to
buy the aircraft as it's primary fighter.