Kaminskaya started her international career in 2007 when she competed at the
Junior World Ski Championships in
Tarvisio, finishing 69th in 10 km pursuit and 82nd in 5 km freestyle. Kaminskaya made her
World Cup debut on February 2, 2012, in
Moscow, when she finished 38th in sprint. While competing for Belarus, her best World Cup finish was 37th in a freestyle sprint race in
Ryabinsk during the
2014–15 season. She competed at the
2018 Winter Olympics where she took part in four events. At those Games, Kaminskaya was the only one in her team born Belarus. Kaminskaya's transition to the Ukrainian team was announced in June 2018. On November 24, 2018, Kaminskaya debuted for Ukraine at the World Cup stage in
Ruka where she was 61st in sprint. In 2022, Valiantsina Kaminskaya was nominated for her third
Winter Games in
Beijing as a member of Ukrainian national team. She finished 79th in the 10 km event, 70th in the women's sprint qualification, and was part of the relay team which finished 18th. Kaminskaya failed a doping test and was suspended during the Olympics on February 16. Kaminskaya participated at three
World Championships: in
2013 (for Belarus),
2019, and
2021 (both for Ukraine). Her best personal performance was 42nd in 30 km mass start in
2021. She also took part at the
2009 Winter Universiade, with her best personal result being 24th in sprint. ==Cross-country skiing results==