President Joe Biden has authorized the use of U.S.-supplied long-range missiles by Ukraine to strike even deeper inside Russia, the latest easing of limitations meant to prevent the conflict from further spiralling, according to one U.S. official and three people familiar with the matter.

Two U.S. officials say President Joe Biden will allow Ukraine to use long-range missiles supplied by the U.S. to strike Russia. NBC News' Kelly O'Donnell outlines the administration's stance on Ukraine using long-range missiles since Russia's invasion.

President Joe Biden has authorized the use of U.S.-supplied long-range missiles by Ukraine to strike even deeper inside Russia, the latest easing of limitations meant to prevent the conflict from further spiraling, according to one U.S. official and three people familiar with the matter.