On 8 August 2007, he lost his left arm and fractured the other one in an accident with a tractor, when he helped his father.

[3] In 2009, Lekomtsev started practicing association football and athletics until his mother helped him to choose skiing.

[5] He won the gold medal in the men's 12.5 km standing cross-country skiing event at the 2021 World Para Snow Sports Championships held in Lillehammer, Norway.

[6][7] He also won the gold medal in the men's long-distance standing cross-country skiing event.

[8][9] In biathlon, he won the gold medal in the men's 6 km standing event.