Why did Austria declare permanent neutrality in 1955?

Austria declared permanent neutrality in 1955 as a direct condition for regaining its full sovereignty and securing the withdrawal of foreign occupation troops following World War II.12

After the war, Austria was divided into zones of occupation by the United States, Great Britain, France, and the U.S.S.R.. For years, the conclusion of a formal peace treaty was stalled by the broader tensions of the Cold War, as the Soviet government was unwilling to relinquish the strategic advantages of maintaining forces in Austria while it perceived Germany as a potential threat.12

In February 1955, the Soviet Union unexpectedly invited the Austrian government to Moscow for bilateral negotiations. During these talks, the Soviet government agreed to restore Austrian independence and evacuate its troops in exchange for a formal promise from Austria to adopt a policy of permanent neutrality. Following this agreement, the Austrian State Treaty was signed in May 1955, and a constitutional law of perpetual neutrality was subsequently promulgated on October 26, 1955.123