TEHRAN, Iran -- A top commander of Iran's elite Revolutionary Guard says his country is currently building its own advanced anti-aircraft missile system, after Russia wouldn't sell it one.

Gen. Mohammad Hasan Mansourian said Wednesday to the state news agency testing would soon begin. His comments come after Russia banned all sales of S-300 missile systems to Iran, citing the latest U.N. sanctions.

Russia signed a 2007 contract to sell the sophisticated systems that could boost Iran's ability to defend against air strikes. Israel and the United States objected to the deal.

Mansourian also said that the military has locally-built missiles that allow the country to defend its airspace.

Iran frequently announces new advances in its military technology that cannot be independently verified.