The long and complicated history behind the Ukraine-Russia crisis

The threat of a possible Russian invasion looms over Ukraine, as the Kremlin continues to build up its military forces along Ukraine's borders, Meanwhile, Western allies are still trying to de-escalate the crisis, hoping to reach a diplomatic solution.

But how did the two countries get to this point? From the fall of the Soviet Union, to Russian President Vladimir Putin's political games, Eric Sorensen looks at the long and complicated history between the two nations.