Erdogan Pushes for Russia's Return to Black Sea Grain Deal
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Russia withdrew from the Black Sea grain deal in July, complaining obstacles to its exports.
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Turkey's Erdogan says excluding Russia from talks to revive the deal will not work.
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Russia, Ukraine, Turkey will continue discussions on the grain deal.
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Erdogan held talks with Japan's PM on efforts to revive the deal.
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Any deal that isolates Russia may not be sustainable, Erdogan said after G20 summit.