Ukrainian tennis player Sergiy Stakhovsky says he hopes he will not have to use the gun he has been given after signing up to help his nation's defence against the Russian invasion.
Boxer Vasiliy Lomachenko, a three-weight champion, is another sports star to join Ukraine's reserve forces and has been photographed with a rifle.
Heavyweight boxing champion Oleksandr Usyk is also thought to have signed up.
Stakhovsky said: "I know how to use the gun. If I'll have to, I'll have to."
The 36-year-old retired from tennis after the Australian Open in January and has returned to Kyiv to help his nation's defence.