The most difficult foreign policy problem of the state involved relations with Hungary, which had annexed one third of Slovakia's territory by the First Vienna Award of 2 November 1938, Slovakia tried to achieve a revision of the Vienna Award, but Germany did not allow it.
Following Slovak participation in the Axis invasion of Poland in September 1939, border adjustments increased Slovakia's area at the expense of previously Polish-controlled territory in the areas of Orava and Spiš [REF].