During World War II, Reichskommissariat Ukraine (abbreviated as RKU) was the civilian occupation regime ("Reichskommissariat") of much of Nazi German-occupied Ukraine (which included adjacent areas of modern-day Belarus and pre-war Second Polish Republic). It was governed by the Reich Ministry for the Occupied Eastern Territories headed by Alfred Rosenberg. Between September 1941 and August 1944, the Reichskommissariat was administered by Erich Koch as the "Reichskommissar". The administration's tasks included the pacification of the region and the exploitation, for German benefit, of its resources and people. Adolf Hitler issued a Führer Decree defining the administration of the newly occupied Eastern territories on 17 July 1941.