He competed in the
2018 Summer Youth Olympics in
Buenos Aires, Argentina. There he was 11th (out of 21 competitors) in the boys' combined competition. Tkach debuted at the senior level in 2018 when he participated at the
2018 World Championships. He finished 5th at the
2020 European Championships. In the
2021 season, Tkach finished 10th in the men's IFSC World Cup in the competition speed discipline. He finished 10th in the combined classification at the
2021 World Championships. In the qualification seeding round of the
2024 Summer Olympics, Tkach received the 7th with the best time of 5.11. He finished the competition after losing 0.01 seconds to France's
Bassa Mawem in the next round and placed in the 9th position. == Major results ==