If the disintegration of Germany and overly punitive measures toward the Weimar Republic's economy created instability and the political climate necessary for WWII, why didn't the West's punitive economic measures and the following disintegration of the Soviet Union also result in large scale war?
I don't really seem that much in common between the two situations. Germany lost WWI, and under the terms of the Versailles Treaty, it was forced to take responsibility for the war, and was, among other things, forced to pay very large reparations and significantly reduce the size of its military. However Germany didn't really disintegrate. It lost a bit of territory but calling it disintegration would be gross exaggeration.
By contrast, the USSR didn't lose any wars. It was not subject to any treaty. It wasn't really facing any "punitive" measures from the West. The only thing that happened was that the US increased its military budget however its effect on the USSR shouldn't be overstated. The USSR disintegrated largely for internal reasons.
What punitive measures are you referring to with respect to the Soviets?