Ukraine is now fighting off the biggest European attack since WWII. Russia has invaded the Democratic country with missiles, air raids, tanks, and troops. Ukraine's leader has called on everyone to fight back, turning civilians into soldiers.

To help us better understand this conflict and how it impacts the rest of the world, we are speaking with Dr. Fred Kagan.

He's a scholar and the director of the Critical Threats Projects at the nonpartisan think tank American Enterprise Institute. He has won the prestigious Medal for Distinguished Public Service from the U.S. Defense Department. And, his expertise dates back more than 30 years, from when he got his Ph.D. in Russian and Soviet military history at Yale University.

We talked to him about Russia's invasion strategy, the possible damage to the Ukrainian people, and whether he thinks Russia will pose an even bigger threat to the rest of Europe.

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