Troops of the Warsaw Pact would have loved a deployment to the Mexico US border...Bulgarian, Czechoslovak, East German, Hungarian, Polish and Romanian troops would have deserted to the USA in their thousands....not to mention members of the prisoner nations within the USSR, Latvians, Lithuanians, Estonians, Byelorussians , Ukrainians, Georgians, Armenians and Russians themselves would have taken the opportunity to go for freedom .

As it is, of the ex Warsaw Pact countries many have become members of NATO...the Czechs, Hungary, Poland , Bulgaria and the Baltic nations.