muslim civilians this has deeply angered the global jihadi movement and massively energized the global jihadi movement. according to vladimir putin up to 7,000 russian nationals, people from the former soviet bloc countries have traveled to syria even iraq, joined groups like isis and the worry is they are coming back into russia to launch attacks particularly concerned about people from the caucuses region of russia joining groups like isis, they've emerged as some of the fiercest fighters in isis, and they were responsible the fighters from the russian caucuses for the istanbul airport attack last summer so concern of a new wave of terrorism now heading russia is blowback for their intervention in syria. >> when is the last time, paul, we saw a terrorist attack akin to we don't know if this is one, we don't know if it's really ours but what would history show us in terms of the attacks that russia has faced again you mentioned the threat from the