Putin said recently: the downfall of the Soviet Union is one of most tragically moments in the world history.
he is determined to bring Russia to the glorius past.
give him some years, you will see. Crimea is just the beginning.
as for Vietnam, you will see, too how Vietnam can help him to achieve that goal. in economics, a hint: Vietnam is going to join soon the Russian led economics bloc consisting of Belarus, Kazakhstan and Russia. Vietnamese government promised that during the Russian PM in Hanoi recently.
Russia is keen to win Vietnam as partner, as they want access to markets in ASEAN.