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WASHINGTON — The United States has accused Russia of sending attack helicopters to Syrian President Bashar Assad’s regime as it warns of a dramatic escalation in the Arab country’s 15-month conflict.

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Secretary of State Hillary Clinton says the delivery represents the “latest information.” She says the U.S. is concerned as the helicopters “will escalate the conflict quite dramatically.”

“There’s no doubt that the onslaught continues, the use of heavy artillery and the like,” Clinton told a discussion with Israeli President Shimon Peres hosted by the Brookings Institution.

Clinton is calling instead for Moscow to help the U.S. push forward a political transition plan for Syria.

Russia has consistently said it would not condone the use of outside forces to end the conflict and has said that it would not supply arms that would aid the government in quelling the uprising.

“They have from time to time said that we shouldn’t worry, that everything they’re shipping is unrelated to their actions internally. That’s patently untrue,” Clinton insisted.