By the final stages of the war, however, the weakening position of Japan across the region and the Japanese requisition of supplies and materiel reduced the military benefits to Siam, turning an unequal alliance into an increasingly obvious occupation. Allied air power achieved superiority over the country, bombing Bangkok and other targets. The sympathies of the civilian political elite, moved perceptibly against the Phibun regime and the military, forcing the prime minister from office in June 1944. With the fall of Japan, France and Britain insisted on the return of those lands annexed by Siam during the conflict, returning the situation to the situation "ante bellum".