USA TODAY / AP  –  Russia has failed to show up at a meeting planning the 2016 Nuclear Security Summit, U.S and European officials said Monday, in a potentially serious blow to efforts by President Barack Obama to cement his legacy as leaving the world safer from nuclear terrorism than when he took office. The officials said it was not immediately clear whether Moscow intended to boycott the summit itself or was just temporarily showing displeasure over Washington’s harsh condemnation of Moscow’s role in Ukraine unrest and the U.S. lead in orchestrating Western sanctions and other punitive measures in response. Continue