On Saturday night, with his heavily armed mercenaries closing in on Moscow, Yevgeny Prigozhin abruptly announced that he was shutting down his insurrection after a negotiated settlement that would allow him to walk away peacefully. Just two days later, the Russian authorities leaked word that the agreement was already toast. After one of the most extraordinary days in modern Russian history, which saw Prigozhin seize the military’s southern command HQ in Rostov-on-Don before a column of his fighters sped toward Moscow virtually unopposed, it was announced that the former Putin confidant would be granted an amnesty and allowed to head...