The USSR was only dependent on the US for food imports during its final years, by which point there was little real concern about war between the two powers, an

The USSR was only dependent on the US for food imports during its final years, by which point there was little real concern about war between the two powers, and indeed the US was trying to actively prop up the USSR because it was worried about the power vacuum that could result from a collapse. The whole issue with the Yugoslavian and Soviet states was that they weren't separate states with trade relations but were instead held together as single nations by force.