It's been one request that absolutely nobody is willing to grant. While many NATO members are sending arms and aid to Ukrainians, President Volodymyr Zelenskyy's pleas for a no-fly zone over his country have been rebuffed. And there's a good reason for that.

Today: How a no-fly zone works, why allies are refusing to enact one, and what happens next in Ukraine, where Russian forces continue to increase the destructiveness of their attacks...

GUEST: Abbie Shull, junior military and defense reporter at Business Insider

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