The Kremlin said on Friday the Ukraine war was "existential" for Russia, after it launched a wave of retaliatory drone and missile strikes that killed at least four people.

Senior Ukrainian officials visited Washington on Tuesday seeking U.S. support against Russia, as Kyiv showed its ability to fight on by setting off an explosive device under a bridge that has become a symbol of the Kremlin's claims on Ukrainian territory.

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.