Why Russia's Vast Security Services Fell Short on Deadly Attack - The New York Times
- Why Russia's Vast Security Services Fell Short on Deadly Attack The New York Times
- Russia Tightens Security In Wake Of Moscow Concert Shooting Radio Free Europe / Radio Liberty
- Analysis | Putin sees Kyiv in Moscow terrorist attack. But ISIS is its own story. The Washington Post
- Russian investigators receive more than 100 missing person reports after Moscow concert hall attack CNN
- Putin Is 'Losing Control' in Russia: Dictator Expert Newsweek