US claims Russia is using North Korean weapons

US officials say Russian forces are using North Korean ballistic missiles against Ukraine. National Security Council spokesperson John Kirby says their use is a "significant and concerning" escalation in Pyongyang's support for the invasion. Russia denies any involvement with North Korea. This is despite a meeting in September between Kim Jong-Un and Vladimir Putin to discuss potential military cooperation. The US says the arms transfer is a violation of Russia's UN Security Council obligations - and will discuss sanctions at the next UNSC meeting.