President Biden and other world leaders say it’s too dangerous to admit Ukraine into NATO while it’s at war with Russia. But, to the dismay of allies, the US will send cluster bombs to the front.

This episode was produced by Avishay Artsy, edited by Matt Collette, fact-checked by Laura Bullard with help from Amanda Lewellyn and Hady Mawajdeh, engineered by Patrick Boyd, and hosted by Noel King.

Transcript at vox.com/todayexplained

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