U.S. concerned about Russian arms sales to Iran

by Barbara Starr, CNN Pentagon Correspondent
August 20, 2015

U.S. officials are concerned that Russia is moving ahead with plans to sell Iran a sophisticated missile defense system that could undercut Washington's ability to challenge Tehran's airspace. The advanced S-300 air defense system would mean that U.S. or Israeli warplanes likely couldn't sneak into Iranian airspace if they wanted to bomb Iran's nuclear facilities.