Foreign Policy cites the Atlantic Council for hosting an event with Ukrainian National Security Council Chairman Andriy Parubiy: 

Andriy Parubiy, a spokesman for the Ukrainian National Security and Defense Council, offered his own interpretation of what the press conference signified  at a talk hosted this week by the Atlantic Council in Washington, D.C.. The disparagement of Strelkov, he said, was the result of an internal spat between separatist factions vying for Putin’s attention and succor. Strelkov “had received large amounts of money from the Kremlin and was not appropriately sharing it with the various other leaders,” Parubiy said. “This tension has become highlighted as it seems that Russia may be quietly ignoring pleas for more help from separatists holed up in Donetsk.”

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