Russia says it’s hard to believe Islamic State could have launched Moscow attack Yahoo! VoicesAnalysis | Putin sees Kyiv in Moscow terrorist attack. But ISIS is its own story. The Washington PostRussian investigators receive more than 100 missing person reports after Moscow concert hall attack CNNUkraine war updates: Russia says it’s ‘hard to believe’ Islamic State group behind terror attack; death toll rises to 140 CNBCRussia’s tragedy, Putin’s humiliation The Atlantic