Valid mechanism to transfer pension to East Europe

Hello ladies and gentlemen: I want to ask for advice to transfer pension funds from a country as Mexico to East Europe countries as Ukraine, Russia, Bielorussia, etc. On my retirement, the amount of monthly payment can go from USD $2,500 up to USD $11,500 (last can be achieved if I add 5% of my actual income , every month). I know there are strict laws on money transfers in order to avoid illegal actions. What and how can be done legally? Any hint or recommendations are welcomed. Salvador