The Ukranian state of Crimea is preparing for a referendum this Sunday to decide its future geopolitical affiliations, despite Ukraine's interim government declaring the vote unconstitutional. As the world waits to see how tensions between Ukraine and Russia will escalate, experts are weighing in on the matter. Today former U.S. Ambassador to Ukraine Steven Pifner, spoke out about Russia's interest in Crimea and the politics behind the crisis. Alex Kekauoha reports.