“Putin believes that in historical terms, as in Peter the Great and so on, blood will be forgotten and his legacy as the uniter of the ‘Russian lands,’ no matter the cost, will remain,” Nina Khrushcheva, an international-affairs professor at the New School in New York and the great-granddaughter of former Soviet Premier Nikita Khrushchev, told me. She said the Russian leader appears to “have lost all grip on reality, more so than I was willing to admit only yesterday.” She added, “I didn’t think he was suicidal, but he clearly is, and is taking the world and us with him.”