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Russia and Ukraine are holding large military exercises along their shared border as the Ukrainian military claims to be closing in on rebel strongholds in Donetsk and Luhansk, NPR's Karoun Demirjian reports from Moscow.
Government troops and separatists have been fighting for months for control of eastern Ukraine, Karoun says, and Ukrainian leaders say Russia has been supplying the separatists with weapons and strategic assistance — a charge Moscow denies.
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