First, I mean you no harm and disrespect.
It was the Chinese that supplied North Vietnam in the begining and still hepled them through 1975. So that you know (which you probably already knew) the Russians gave them a tremendous amount of support. But during Vietnam, you'll see, if you were to read America's view of it and what they came across as far as ordnance was concerned; they came across mostly chinese built weapons. Ak-47's came from East Germany, China, Hungary (not many though, RARE), yugoslavia, Russia, and the North Koreans. The ammunition was contibuted from all Communist nations including Cuba. Hand grenades came from both the Chinese and Russians, with Bulgaria in there too. This war was truely a Communist Affair!
Also, by the way, East Germany provided Nurses and Doctors too. Czechoslovakia (SP?) and Bulgaria supplied some amunition too.
The NLF/VC produced their grenades by hand and in a jungle cave or in one of their "areas" back at some base camp. This, if only they could not get an American grenade.
I hope this answers all your questions and I apologize for my percieved arrogance, or my confusing questions if it is the way you felt that I came across this way. Just providing facts, Sir