"We don't see this as a positive development," he added. "At the same time, here at the Defense Department, again, the president will have options available to him even if that system is put into place," said Cook.

According to a media report, Iranian Defence Minister Hossein Dehghan announced on Tuesday an agreement had been reached with Russia for Tehran to procure the S-300 long range surface to air missile systems.

"The text of the contract is ready and our friends will go to Russia next week to sign the contract," Dehghan said.

The prospective arms sale came at a time when Iran and six world powers reached a deal in July to limit Tehran's nuclear program in exchange for lifting all nuclear related sanctions.

The S-300 system, first deployed at the height of the Cold War in 1979, is designed for the air defence of large scale facilities and can engage ballistic missiles up to 186 miles or about 300 km away.


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