But with Putin’s unprovoked invasion of Ukraine, his indiscriminate crushing of its cities and mass killings of Ukrainian civilians, he went from “bad boy” to “war criminal.” And when the leader of Russia — a country that spans 11 time zones, with vast oil, gas and mineral resources and more nuclear warheads than anyone else — is a war criminal and must be henceforth treated as a pariah, the world as we’ve known it is profoundly changed. Nothing can work the same.