By Nandita Bose WASHINGTON (Reuters) – U.S. President Joe Biden will speak with allies and partners on Monday morning after President Vladimir Putin put Russia’s nuclear deterrent on high alert in the face of a barrage of Western reprisals over the war on Ukraine. A White House official told Reuters the Russian president was escalating the war with “dangerous rhetoric” and that Russia and the U.S. have long agreed that nuclear use would have devastating consequences. “A nuclear war cannot be won, and must never be fought,” the White House official said. “We think provocative rhetoric regarding…