They would be best for a Bronze Age setting. Way too out of date for the modern era.
That said, perhaps the presence of Soviet superhumans prolonged the life of the USSR in an alternate Champions universe, and that’s where the campaign is set. It might feel a bit like Watchmen.
Another possible way to use them would be as a part of a plot by Empress V’Han or maybe a time travel mission into the future for them from before the fall of the Soviet Union. After all, if you can bring Captain America forward from World War II into the modern world, you could do it with Soviet superhumans and might be pretty fun to have something so retro running around causing havoc.