Yes, the Islamist influence in the Chechen terrorist campaign is very well established!
The Islamicization of the conflict in Chechnya has seen the former Soviet territory attempt to adopt Sharia (Islamic law) and a strict Islamic moral code, with the hesitant approval of much of the populace.
In fact, bin Laden himself called for an Islamic superstate to be created across the Caucasus...
And there were many Chechens training in bin Laden’s Afghan camps, and among the Al Queda terrorists killed or captured by American and allied troops in Afghanistan.