They were invited in. Wasn't too long before open warfare started. How much the Russians and ChiComs played is hard to say, but they were in the mix..
Just who would be naive enough to invite people en masse into their own country and not expect problems?
read stories of russian reaction to these people... heard they sent back their heads with their sex organs in their mouths??? word was lots of stuff stopped for a time???
Is that where some Russians got kidnapped and the Russians killed an equal number of imam's family members?
Actually, that is a very effective method to counter these types of terrorists. They have already accepted that they will die; however, their families are a totally different scenario. Only the most ruthless terrorist, will allow their family members to suffer the same fate that have chosen for themselves. I could never understand why we didn't use this more. Basically, hold the entire family responsible for the actions of the terrorist, every family member, man, woman, and child.
One last point, please remember that Russia is filled with Muslims and has been for a long, long time. What I am saying is they have first-hand knowledge of dealing with radical Islamists within their borders.