A vacuum is always filled with something and a power vacuum fills very quickly and is almost impossible to stop. When Obama withdrew the US from the world stage others saw their opportunity and none quicker than Putin. Hillary out for personal gain was quick to let the Russians get away with everything so long as money poured into her coffers. Trump maybe able to reverse things but they will never be the same The center of power is shifting to China which will soon be the worlds lone supper power as the US and the West in general is bankrupt.