For Some Analysis Of The Crimean Referendum In Which A Majority Of Crimeans Said They Wanted To Become A Part Of Russia ... And The Subsequent Annexation Of Crimea By Moscow ... VOA's Carol Castiel Spoke With Joshua Tucker, Professor Of Politics And Slavic And Russian Studies At New York University. She Asked Him What Factors Played In President's Putin Push To Annex Crimea. He Said There Were Several Diverse Factors.