And when you really decide to see what was so pioneering in Soviet computing industry, it all boils down from 'pioneering' to only 'interesting'.
Which helps to get a perspective on a true scope of Soviet CS research.
After all, layered copying of Intel x86 CPUs also was 'pioneering and interesting'.
It was; at some periods I think Soviets were world leaders in electronics reverse engineering. Those techniques were rumored to get used well after USSR death in some Asian countries.
MESM -> BESM-6 machines I've heard had some abilities like a number of simultaneously supported IO ports (AS system for space program?) - which may or may not be considered pioneering. Another example is Setun ternary computer; of course that's providing we should consider some computers after ENIAC 'pioneering enough'.