In the hours following Russia's invasion of Ukraine, Ukraine's foreign minister tweeted out a call for what he called an international legion of fighters to come to Ukraine and fight against Russia. And so far, it seems that some have heeded that call. Jacob Schulz talked with Daniel Byman, Lawfare’s foreign policy editor and a senior fellow at the Brookings Institution, who is the author of a book on foreign fighters. They talked through the history of foreign fighters in different conflicts, how to think about the inflows into Ukraine and what the downsides might be of the phenomenon of foreign fighters traveling to Ukraine. 

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