To what Extent Did German Foreign Policy Become More Openly Nazi Rather than Purely Nationalist in the Course of 1938?

There are distinct differences between Nazi Foreign policy and the policy that a conservative nationalist government would have followed. I believe that up to 1938 Hitler was following a generally Nationalist foreign policy, then in 1938 there were key turning points, which led to his foreign policy becoming radically Nazi.
Previous to 1938 German foreign policy was mainly based on aims of the Nationalists. It is important to remember the difference in aims between the Nationalists and the Nazis, the nationalists wanted to follow a specifically revisionist policy, reversing what had been p…