Western countries traded with the Russians during the Cold War so this seems like a weak argument. Where does the NATO treaty stipulate a trade embargo against the Russians?
In the cold war, it was the USSR which was more dependent. Without food grown in North America, they were (IIRC) looking at WWII levels of rationing, in the 80s, which would have made people pretty unhappy. They sold oil to buy this food, but most of the west could have got by without this trade. (Not sure how dependent W.Germany was, at that point.)