WASHINGTON, January 14, /ITAR-TASS/. U.S. Administration is concerned by recent reports that Russia and Iran are negotiating a barter agreement, under which they might swap oil for commodities, the White House said.

"We are concerned about these reports and Secretary of State John Kerry directly expressed this concern with Russian Foreign Minister Lavrov," Caitlin Hayden, a spokeswoman for the U.S. National Security Council told reporters.

"If the reports are true, such a deal would raise serious concerns as it would be inconsistent with the terms of the P5+1 agreement with Iran and could potentially trigger U.S. sanctions," she said.

A number of Western media came up with the assertions last Friday saying that Moscow and Teheran were conducting talks on a swap pattern, under which Russia would get up to 500,000 barrels of Iranian crude oil a day and would supply Russian commodities to Iran in exchange.

The media rumors suggested that the transactions would amount to $ 1.5 billion a month.