Ukraine President Zelensky is in Copenhagen meeting European leaders as they pledge to again boost support for his country's defense. Arseniy Yatsenyuk, who served twice as Ukraine's prime minister and was a leading figure during the pro-Western 2014 Maidan Revolution, joins Christiane in London. 

Also on today's show: actor/activist Jane Fonda & SHINE Collab Director Mela Chiponda; Task Force on Nuclear Proliferation and US National Security co-chairs Meghan O'Sullivan and Ernest Moniz