A Ukrainian serviceman smokes a cigarette at his position at the frontline near Bakhmut, Donetsk region, Ukraine, Wednesday, January 11, 2023. (Photo by Evgeniy Maloletka/AP Photo)

A Ukrainian serviceman takes a rest near the town of Bakhmut, in the Donetsk region on April 28, 2023, amid the Russian invasion on Ukraine. (Photo by Dimitar Dilkoff/AFP Photo)

Ukrainian service members of the 3rd Separate Assault Brigade attend military exercises near the town of Bakhmut, amid Russia's attack on Ukraine, in Donetsk region, Ukraine on September 7, 2023. (Photo by Reuters/Stringer)

A Ukrainian serviceman smiles on May 21, 2024 during a moment of calm in the southeastern town of Orikhiv, Zaporizhzhia, which has been heavily damaged by Russian military strikes. (Photo by Reuters/Stringer)

Girls refresh themselves and their dog with water spray frames set along the central street of the Ukrainian capital of Kiev during a heatwave on June 25, 2020. (Photo by Sergei Supinsky/AFP Photo)

A line of soldiers firing handguns during a training session, circa 1920. (Photo by Keystone). P.S. All pictures are presented in high resolution.

Three Chinese soldiers at the time of a civil war in China. (Photo by General Photographic Agency/Getty Images). 1922

A Saudi soldier fires a mortar towards Houthi movement position, at the Saudi border with Yemen April 21, 2015. (Photo by Reuters/Stringer)