How Russia's Nuclear Arsenal Figures In

A protester holds a sign outside U.N. headquarters, Friday, Feb. 25, 2022, in New York.

Over the weekend, Russian President Vladimir Putin announced a nuclear alert—and the US chose not to respond in kind. Fred KaplanSlate's War Stories columnist and the author of many books, including The Bomb: Presidents, Generals, and the Secret History of Nuclear War (Simon & Schuster, 2020), discusses the latest developments from Ukraine.