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What will it take for Ukraine to defend against the ballistic missiles, cruise missiles and explosive drones raining down on the country? The question is not so much what as how many.

Iain Boyd has written a new column in The Conversation on missile defense systems, how they work, and what Ukraine can do with them.

Boyd is a professor in the Ann and H.J. Smead Department of Aerospace Engineering Sciences and is the director of the CU Â鶹ӰԺ Center for National Security Initiatives.