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Why did some people question whether NATO was needed after the Warsaw Pact dissolved in 1991?

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Flag of NATO featuring a white compass rose emblem with four lines radiating from the center on a blue background. — North Atlantic Treaty Organization Flag of the North Atlantic Treaty Organization (NATO).

After the dissolution of the Warsaw Pact in 1991, some observers questioned the continued necessity of the North Atlantic Treaty Organization because the alliance’s primary purpose—to unify and strengthen the Western Allies' military response to a potential invasion by the Soviet Union and its allies—had been fundamentally undermined.12

With the Soviet Union’s abandonment of control over central and eastern Europe, the military threat that the Warsaw Pact had formerly posed to western Europe dissipated. Consequently, critics argued that the alliance was created to confront an enemy that no longer existed and suggested that it should be dissolved.12

In response to these changing geopolitical realities, the alliance underwent a transformation. Rather than dissolving, NATO shifted its focus toward becoming a more "political" alliance dedicated to maintaining international stability in Europe, eventually taking on new roles such as peacekeeping in the former Yugoslavia and expanding its membership to include former Soviet allies.12