Some of the best engineers that I've worked with (in the US and Europe) are Russian. I've also been quite impressed with other former Iron Curtain developers. A lot of Chinese folks I've worked with have been good.
I know that some nations are known for threatening the relatives of expats, to get them to work on their behalf. Not very nice.
But state-sponsored Russian (or other nations, as well) is definitely something to be concerned about. I suspect a number of folks are concerned about the influence of American programmers. The CIA is known for using fairly innocuous employees of NPOs. My father was one.