Even assuming that Russia had even part of their old Soviet nuclear capability (which they don't), their goal was (and probably still is) to dominate the US, to surpass us in influence - on the other hand the Islamists goal is the total annihilation of America.
That was never the Soviet goal. They did not want to lose themselves in the process, the Islamists don't care.
The islamists are making a big mistake. They assume that Allah's command is also Allah's will. What they don't appear to know is that Allah's command and Allah's will can be different. If Allah doesn't will something but commands it, it won't happen. Why is beyond us to know, but that's how it is. That is on the best authority, who even Ormud Pamuz quotes in his Nobel Prize winning book, and he is totally moslem Turk.