Karpyuk was the chairman of the Rivne cell of the Ukrainian National Assembly. In 1992, he participated in the Transnistria War on the side of Transnistria and in the War in Abkhazia, in 1993, he fought on the side of Georgia. He took part in the Ukrainian parliamentary elections of 1998 and 2002 for UNA-UNSO, but the party did not go to the Verkhovna Rada both times.