Doping is just as globalized as any big corporation. The chemists and the almighty dollar/euro/yen are not patriots of any nation.
A Nigerian was just busted for doping.
The Russians, at least the women, can't seem to go a week without some infraction.
The drugs will flow to whomever wants them and has the funding (thousands, not millions) and system in place to not expose the source, wherever it may reside.
Brett Favre is now a Viking, which was absolutely incomprehensible just a few years ago. Why? Money and attention, which supersedes all rivalries, loyalties, and borders.