its america -> japan war and AK47 is russian weapon so it doesnt fit into the fallout universe :\ (correct me if i'm wrong but russians have no role in fallout's storyline)
It's America ->
ChinaThe AK-47 is a
world wide weapon, adopted by LOADS of states, like all east-european states, and african countries and, hear me now, http://en.wikipedia.org/wiki/Type_56_assault_rifle.
And Russa is not mentioned alot, no. Some info about them in the Museum of Technology, and one of the starting characters in Fallout 1 was the grand child of a russian ambassador. From what I've heard, Russia were friendly towards USA by the time of the war. Not much info about them otherwise, but that doesn't stop Obsidian or Bethesda from adding something russian?
Dukov is russian. He couldn't have been born and raised in the US, the dialect wouldn't remain for 200 years, so he probably came to USA by himself like Moriarty and Tennpenny.