The former Soviet Union, even at its peak, never presented much of a challenge to the United States. In other words, any military alliance with the United States was bound to be one-sided. Needless to say, the United States signed these treaties not because it engages in charitable work, but because it was beneficial to do so. This point must not be misunderstood. In this sense, Japan has made extraordinary efforts.
Japan arguably has the most reciprocal relationship in the world with the United States.
Unfortunately, ignorance about the strategic philosophy of the United States is a source of illusion in both the United States and Japan. This belief is demonstrably false. A look at recent developments reveals this contrast. However, US military bases in Japan are far from being reduced or withdrawn even after the collapse of the Soviet Union and thus the end of the cold war. In fact, they are being further strengthened.