Censor.NET reports citing Inside the Games.
Demchuk was successful in the men's individual sabre category A event whilst Datsko claimed his second Paralympic medal in the B tournament.
The third seed, Demchuk, comfortably beat Hungary's Richard Osvath 15-8 to win his first ever Paralympic medal.
The 28-year-old gained control of the bout in the opening period where he scored nine points to Osvath's two.
They went on to tie the second 6-6 which was enough to secure the victory for the Ukrainian without having to contest a third round.
Datsko convincingly beat the tournament's number one seed Panagiotis Triantafyllou of Greece 15-7 at the conclusion of the second period to win his second Paralympic medal.
The 33-year-old has previously won a silver medal in the men's individual foil in London four years ago.