Russia launched an intense missile and drone barrage at the Ukrainian capital Kyiv in the early hours of Friday, killing at least six people, Ukrainian officials said, as powerful explosions reverberated across the country.

Russia will respond to Ukraine's latest attacks as and when its military sees fit, the Kremlin said on Thursday, accusing Kyiv of state terrorism and confirming that President Vladimir Putin had told Donald Trump that Moscow was obliged to retaliate.

Following Ukraine’s recent drone assault on Russia, where Ukraine used $300 drones to take out $100+ million Russian bombers, questions mount about what’s next for the Ukrainians. Eurasia Group and GZERO Media president and founder Ian Bremmer joins Katy Tur to break down why “we don’t see any possibility of [the war] ending anytime soon.