When Eli Rosenbaum was hunting Nazis hiding in America, the most he could do was deport them, but he says the US is now poised to change its laws so that he will be able to prosecute Russians responsible for war crimes in Ukraine. Rosenbaum, who spent much of the past 40 years leading the US government’s pursuit of Nazis, has been appointed as the head of the justice department’s War Crimes Accountability Team, set up in June to help bring war criminals to justice for atrocities in the Ukrainian conflict. Widespread outrage at Russian mass killings and deportations as...