Ukraine used British-made Storm Shadow missiles to hit targets in Russia for the first time, which Russia says could be cause for larger-scale retaliation. The US Embassy in Kyiv closed amidst fears of a potential significant air attack on November 20. The use of Western weapons to strike into Russian territory is seen as a major escalation in the conflict, with Russia warning of potential retaliation with weapons of mass destruction. Ukraine argues that it needs to defend itself by hitting Russian rear bases used to support Moscow's invasion. Russian war correspondent accounts on Telegram posted footage of the missiles striking in the Kursk region.