Praque 1968 all over again.
I think Russia has memories of 1978 and the Iranian Revolution.
Russia is fearful of events in the Stans - Stalin et al moved millions of Russians there in the 20-60s where, in Kazakhstan, they briefly became the majority. Now demographics have done their work and the population is 65% Kazakh and 23% ethnic Russian - and Islamic/Orthodox in the same percentages.
Russia fears contagion from Afghanistan through Turkmenistan and Tajikistan and north into the southern Russian republics and will stamp down heavily, and/or assist in stamping down, on any populist uprisings.