The source of your information is RT. Of course they are going to come down on the side of KGB Putin and company.
“RT, previously known as Russia Today, is a globally broadcast English-language news channel from Russia, and the first all-digital Russian TV network, sponsored by the state owned Russian news agency RIA Novosti.[1]”
http://en.wikipedia.org/wiki/RT_%28TV_network%29
The point being here is; if the Chechens did it, they will proudly take responsibility for it...
They haven’t been shy about laying claim to their acts of terror.
It is common knowledge that RT favors the Russia line...
It’s a wait and see....