Andrii, who lives about 70 kilometers (44 miles) from the front line in eastern Ukraine, had served two years in combat and described his injuries — a concussion and taking shrapnel in his right leg from an exploding land mine — as “minor.” Like so many other Ukrainians, he’s lost friends and loved ones.

The Ukrainian dropped Dubois twice in the fifth — the second time with a lunging left cross.

The veterans are employees of Ukraine’s largest private energy company DTEK, which has partnered with Usyk to raise awareness about the plight of the country’s civilian energy infrastructure since th...