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In page Anti-Comintern Pact:

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A candidate for membership in the eyes of the Axis Powers was the Second Polish Republic. Poland had cooperated with Germany on the occupations of Czechoslovak territory after the Munich Agreement and seemed like an approachable partner, but the German offers of a Polish membership in the pact were tied to a return of Danzig to Germany, something that Poland was unwilling to accept out of concern for its access to the sea and its policy of equal diplomatic distance between Germany and the Soviet Union.[1]:455[2]:42