Fate of Ukraine hangs in the balance

As Russian forces encircle the Ukranian capital, Christiane speaks with Ukrainian MP Lesia Vasylenko, hunkered down in Kyiv ... Exiled Belarusian opposition leader Svetlana Tikhanovskaya issues a warning about Belarus strongman Alexander Lukashenko, who's supporting the Russian invasion ... Foreign policy expert Angela Stent talks to Walter Isaacson about the global ambitions of Vladimir Putin ... Veteran foreign correspondent Jane Perlez discusses the Russian/China alliance against the United States and what Richard Nixon did to pull them apart 50 years ago this week.

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