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When Russia invaded Ukraine, it put the global food supply at risk \u2014 until the two countries struck an unusual deal to keep shipments flowing. \n\nLast week, that deal fell apart.\n\nMarc Santora, who has been reporting from Ukraine since the beginning of the conflict, explains what the collapse of the agreement means for the war and why its impact will be felt by tens of millions of people across the world.\n\nGuest: Marc Santora, a Ukraine correspondent for The New York Times.