A Second American Has Died in Ukraine. He’s Unlikely to Be the Last

He went to Ukraine to help beat back the Russian invasion. But a moment of clumsiness, or merely a stroke of bad luck, cost Stephen D. Zabielski his life. The U.S. Army veteran was killed by a landmine in southeastern Ukraine, according to multiple sources familiar with the matter. That makes him the second American citizen to have died as a combatant in the conflict.

The U.S. State Department confirmed that Zabielski, 52, was killed in Ukraine. An obituary published by his family says that he died on May 15,...