Which statement describes how the Truman Doctrine contributed to the breakdown of relations between the United States and the Soviet Union? The Truman Doctrine threatened the Soviet Union by providing military equipment to France and Great Britain. The Truman Doctrine threatened the Soviet Union by providing funds to build U.S Air Force bases in Spain and Italy. The Truman Doctrine gave economic aid to Greece and Turkey, which threatened the Soviet Union's sphere of influence. The Truman Doctrine instituted economic sanctions on Poland and Hungary, which threatened the Soviet Union's sphere of influence.