The Lithuanian government in Kaunas, which viewed the city as the historic capital of the Grand Duchy of Lithuania, saw the Polish incursion as an occupation. The Lithuanian government demanded Vilnius back. Relations between the Polish and Lithuanian governments, unable to reach a compromise over Vilnius, continued to worsen, destroying the prospects for Piłsudski's plan of the Międzymorze federation and leading to open hostilities in the ensuing Polish–Lithuanian War. In 1920, the Soviets recaptured Vilnius, followed by the Poles' establishment of the short-lived Republic of Central Lithuania.