Ukraine is marking its independence day today, exactly six months since Russia launched its war to crush it. Although Kyiv cancelled events amid fears Russia might carry out missile strikes, the country quietly but resolutely celebrated its history, its culture, and its resilience in the face of a formidable threat. President Zelensky has reiterated his stance that the war will not end until Ukraine regains every bit of territory lost to Russia, including Crimea. So, will US and European assistance help achieve that? Sara speaks with an adviser to Ukraine's defense minister, Yuriy Sak. 

Also on today's show: Estonian Prime Minister Kaja Kallas; CNN Corresponent Audie Cornish.

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