From a New York Times story by Thomas Gibbons-Neff and Natalia Yermak headlined “Four Seconds to Impact: On the Front Lines With Ukraine’s Snipers”:

The Russian position was marked with the blue flag of Moscow’s elite airborne units but the fabric looked almost translucent through the Ukrainian sniper’s scope.

The flag, atop a Russian-occupied building in southern Ukraine, was just over a mile away. If a Russian soldier appeared, it would take roughly four seconds for the sniper’s large-caliber bullet to reach the man’s chest.

“They move around in the morning and in the evening,” said Bart, the leader of the four-man sniper team.