On Tuesday, Ukraine fired US-made ATACMS rockets into Russia. The strikes came after Washington authorized their use on Russian territory. The aim is to limit Moscow's ability to launch attacks and supply the front. Russia has described the attack as an escalation marking a new phase in the war while Putin has amended Russia’s nuclear doctrine. 00:00 Putin signs Russia's revised nuclear doctrine 03:30 Mariana Budjeryn, Harvard Kennedy School #ukraine #russia #nuclearbomb Subscribe: https://www.youtube.com/user/deutschewelleenglish?sub_confirmation=1 For more news go to: http://www.dw.com/en/ Follow DW on social media: ►Facebook: https://www.facebook.com/deutschewellenews/ ►Twitter: https://twitter.com/dwnews ►Instagram: https://www.instagram.com/dwnews ►Twitch: https://www.twitch.tv/dwnews_hangout Für Videos in deutscher Sprache besuchen Sie: https://www.youtube.com/dwdeutsch