All respect for the office of the presidency aside, I assumed that the obvious and unadulterated decline of freedom and constitutional sovereignty, not to mention the efforts to curb the power of judicial review, spoke for itself.
It was fear. He didn't want to see a united Germany. Stalin made it clear to me - I spoke with him many times - that they couldn't afford to let Germany build up again. They'd been invaded twice, and he wasn't willing to have it happen again.