Moscow Terror Attack: Putin Points Finger At Ukraine; What Is The U.S. Connection? | Weekend Debate

Russian President Vladimir Putin has called the attack in Moscow concert hall a 'pre-planned mass murder' in his address. He has also claimed Ukrainian involvement in the attack. Suspicions have also been raised over the advance advisory issued by the U.S. about a terror attack in Russia weeks before the incident. Who is the real culprit behind the Moscow terror attack which has claimed over 150 lives?