What do the truman doctrine, nato and the eisenhower doctrine all have in common?

How is the Eisenhower Doctrine different from the Truman Doctrine? The Eisenhower Doctrine represented no radical change in U. S. policy; the Truman Doctrine had pledged similar support to Greece and Turkey 10 years earlier. It was a continuation of the U. S. policy of containment of or resistance to any extension of the Soviet sphere of influence.