If they were running weapons to the Syrian opposition through Benghazi, it would make sense that the terrorists were Shia muslim, as in Iran, or the Syrian government, or Russian controlled.
Syria is a proxy war with big players on the sidelines, much like the beginnings of WWI.. This really could blow up big.
I haven’t seen where Syria was attacking another country. Therefore, I don’t see the need to help terrorists overthrow a government.
I certainly don’t see making the Russians as the bad guys here. They have to deal with Islamic extremists just like we do.