Jevhen Malyshev, 19, belonged to Ukraine's junior national biathlon team.
For the past two years, however, he has served in the Ukrainian military.
Last night, the Ukrainian Biathlon Federation announced that Malyshev had died in combat against Russian troops.
"We express our deepest condolences to family, friends and relatives," the union writes on its website.
Now he is mourned by the biathlon world.
The International Biathlon Federation expresses its condolences in a press release.
The IBU expresses its deepest condolences after the loss of former Ukrainian biathlete Yevhen Malyshev, who died this week while serving in the Ukrainian military.
The Executive Board once again condemns the Russian attacks on Ukraine and the support from Belarus. "