 The Bieszczady County was also obtained, thanks to the efforts of Stanisław Leszczycki during the negotiations, covering about 300 square km with Halicz and Tarnica peaks.The dissolution of the Soviet Union into a number of post-Soviet states transformed the Poland-Soviet border into the chain of Poland-Russia, Poland-Lithuania, Poland-Belarus and Poland-Ukraine borders.Poland and Ukraine have confirmed the border on 18 May 1992.