Did any of the nations change their allegiance during the Cold War? If not, should any nation have?

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Explanation:

Since the end of the cold war, NATO has been steadily moving in a direction consistent with the purposes of an alliance of collective security. As early as July 1990, the NATO allies declared that “in the new Europe, the security of every state is inseparably linked to the security of its neighbors.”

The mid-20th-century world was dominated by several alliances, particularly the North Atlantic Treaty Organisation (NATO) and the Warsaw Pact. Cold War alliances both defined and intensified divisions between democratic and socialist nations.