President Biden called Vladimir V. Putin, the president of Russia, a “crazy S.O.B.” during an evening fund-raiser in California, which the Kremlin dismissed as “Hollywood cowboy-style behavior.”

“We have a crazy S.O.B. like that guy Putin, and others, and we always have to worry about nuclear conflict,” Mr. Biden told a crowd of donors in San Francisco on Wednesday night.

Mr. Biden’s comments drew the ire of Moscow, resulting in a blunt tit-for-tat.

Dmitri S. Peskov, the Kremlin…

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