US maintains nuclear posture after Russia's doctrine update

The United States will not change its nuclear posture following Russia's recent update to its nuclear doctrine, according to a White House spokesperson. The U.S. was not surprised by Russia's announcement, which had been anticipated. Russian President Vladimir Putin has lowered the threshold for a nuclear strike in response to various conventional attacks. This change comes amid claims that Ukraine has used U.S.-made missiles to strike deep inside Russia. The U.S. noted no changes in Russia's nuclear posture and sees no reason to adjust its own. The statement also mentioned Russia's use of North Korean troops in Ukraine as a significant escalation.