Fox plays Bonner Fellers, a general who's sent to Japan to decide if Emperor Hirohito will be hanged for war crimes.
Starring alongside him is Eriko Hatsune as Aya Shimada, a woman Fellers romanced years earlier, and Tommy Lee Jones as legendary Us military figure General Douglas MacArthur.
Fox said that he was "really moved" by the script for Peter Webber's film, and found that the true life story was one worthy of big-screen treatment.
On working with Jones, the actor told Digital Spy: "Tommy came on at the very end of the shoot for the last two weeks.
"I think it served the film really well.
"I was the brigadier general up until the point the real general came along - MacArthur showed up.
"Tommy has a presence on his