He became a member of the Central Committee of the Ukrainian Socialist-Revolutionary Party (UPSR) and the Villagers Association.

After the IV Party Congress he was among the members of the central current as Mykhailo Hrushevsky.

From 1919 Khrystiuk immigrated to Vienna, where he was a member of the UPSR "foreign delegation" and worked in the magazine "Boritesia-poboryte!".

He returned to Ukraine in 1924 and worked for the Association of scientific and technological workers to influence the socialist construction (Kharkiv, 1928-1931).

Khrystiuk was arrested on 2 March 1931, as the member of the Ukrainian National Center and was convicted to imprisonment.