First: Putin's forces strike a Ukrainian base just miles from the border with Poland. With millions of Ukrainians fleeing the violence, what is the US prepared to do to stop the killing? We ask National Security Adviser Jake Sullivan.

Today's extended episode also features Kyiv Mayor Vitali Klitschko and his brother Wladimir, who is fighting on the frontlines in Ukraine; exclusive talks with Senators Rob Portman and Amy Klobuchar from the Polish-Ukrainian border; Latvian President Egils Levits; and live reporting from CNN's Clarissa Ward on the latest violence and the death of an American journalist in Ukraine.

Also: CNN Global Affairs Analyst Susan Glasser; House Foreign Affairs Committee member Rep. Colin Allred (D-TX); Former House Intelligence Committee ranking member Jane Harman (D-CA); and CNN Political Commentator Scott Jennings join Dana to discuss the latest developments in Ukraine.

Plus: a special look at life inside Russia from former CNN Moscow Bureau Chief Jill Dougherty and Puck News’ Julia Ioffe.

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