Western treason considers that the United Kingdom, France and sometimes the United States have failed to comply with their legal, diplomatic, military and moral obligations to the Czechoslovakian and Polish countries in the early and post-World War II era. It also sometimes refers to the treatment of other Central and Eastern European countries at that time. According to Ilja Prizel, ”the study of his historical sense of `damaged self` in general has fuelled resentment towards the West and has particularly reinforced the concept of Western betrayal.  Grigori Yavski argues that the damage done to the central European national psyche left by Western ”betrayal” in Yalta and Munich remained a ”psychological event” or a ”psychiatric subject” during the debates on NATO enlargement.  In November 1943, the Big Three (USSR, USA and UK) met at the Tehran conference. President Roosevelt and Prime Minister Churchill formally agreed that Poland`s eastern borders would roughly follow the Curzon Line.  The Polish government in exile did not participate in this secret decision.   The loss of Kresy, or ”Eastern territories,” about 48% of Poland`s pre-war territory, to the Soviet Union was seen by the Poles in exile in London as a new ”betrayal” of their Western ”allies”.  In the spring of 1938, Hitler openly began to support calls by German spokesmen in the Sudetenland region of Czechoslovakia for closer relations with Germany. Hitler had recently annexed Austria to Germany and the conquest of Czechoslovakia was the next step in his plan to create a ”Greater Germany”. The Czechoslovakian government hoped that Britain and France would help in the event of a German invasion, but British Prime Minister Chamberlain tried to avoid war. He made two trips to Germany in September and offered favorable agreements to Hitler, but Fuhrer responded to his demands. The American historian William L.
Shirer estimated in his ”Rise and Fall of the Third Reich” (1960) that Czechoslovakia, although Hitler was not bluffing about its intention to invade, could have resisted considerably. Shirer believed that Britain and France had sufficient air defence to avoid severe bombing of London and Paris, and could have waged a swift and fruitful war against Germany.  He quotes Churchill as saying that the agreement means that ”Britain and France are in a much worse position than Hitler`s Germany.”  After personally inspecting the Czech fortifications, Hitler privately told Joseph Goebbels that ”we shed a lot of blood” and that it was fortunate that there had been no fighting.  The Munich Convention (Czech: Mnichovska dohoda; in Slovak: Mnechovska dohoda; in German: Munchner Abkommen) or Munchner Verrat (Czech: Mnichovska zrada; The Slovak: Mnechovska zrada) was an agreement reached on 30 September 1938 in Munich by Nazi Germany, the United Kingdom, the Third French Republic and the Kingdom of Italy.