What do you mean? They didn't have world-class scientists? They didn't compete in thermonuclear weapon race, with test of their own design (Sloika)? They didn't built world first nuclear power plant for the grid in Obninsk? They didn't participate in particles research, e.g. with invention of Tokamak? Did they steal all of that? Or you're just saying that whatever they did, early on they used most important data from spying? Learning from others, and spying for your adversaries both predate USSR by millenniums.
> And the all of it was fueled by grain stolen from Ukraine
You mean, different part of the same country specialized in different activities? Which grain was stolen - and by whom - from Ukraine (you mean, Ukrainian SSR?) when nuclear research was going on, mostly after WWII?