Why not Chinese suppliers for Yuri's merchandise?
The movie mainly focuses on Yuri getting his merchandise from unsecured Soviet arms caches, but some otherwise legal and state-supported factories do trading on the sly. One of them happens to be Norinco of China. Here are some very interesting articles detailing how some Chinese nationals attempted to sell everything from automatic weaponry to anti-aircraft missile launchers to tanks to what they thought were the heads of a Private Military Company (actually American federal agents on a sting operation):
http://www.justice.gov/usao/cac/pressroom/pr2005/151.html
http://bigpeace.com/bhamer/2010/10/20/exclusive-an-inside-look-at-operation-smoking-dragon/
http://www.publicintegrity.org/investigations/tobacco/articles/entry/762/
I bet that the Chinese have done this before, and that this is only the most recent break into similar operations. Were the Chinese just not in this kind of business much back in the 1980s, which is the time period of this film?