Sanctions generally work when the country which suffers is isolated relatively and rely on trade with the opposite members of the sanctions. When Warsaw Pact existed it formed a separate and relatively independent economic structure from the west. It was named Comecon.
As you said correctly: "All these sanctions are having crippling effects."
This is an essential part of a sanction. If the country or countries don't suffer from the sanction. Of course we all know Comecon as a centrally organized trade agreement was way less efficient than western free trade, but if there were any sanctions against Warsaw Pact members, it would never be efficient at all.
However de-facto there were sanctions between the two blocks, they generally avoided the trade with each other and COCOM list defined a series of high tech equipment which can't be sold to Warsaw Pact members.
These actions were not very effective since both of the blocks were capable to maintain at least a basic living standard from their own resources until USSR overspent their money on military race and had serious structural problems. Also interesting fact is that computers generally weren't sold into USSR and allies, but they managed to make replicas like Hungarian Videoton computers.