TEHRAN (Reuters) - Iran's armed forces on Friday successfully test fired a domestically produced missile which can evade radar, state television reported, a development analysts said could be worrying for Western forces in the Gulf.

Western nations have been watching developments in Iran's missile capabilities with concern amid a standoff over the Iranian nuclear program, which the West says is aimed at building atomic bombs. Iran says the program is civilian.

The missile command of the air force of the Revolutionary Guards has successfully tested a new generation of missiles," Hossein Salami, head of the Revolutionary Guards air force, told state television.

"This missile can evade radar and it can evade anti-missile missiles," he said.

Iran is preparing to test launch later this summer a medium-range multi-stage missile that could have a range of up to 2,650 miles (4,250 km), an independent U.S. specialist said on Thursday.

The missile, code-named Kosar, would carry a version of Russia's RD-216 liquid-fuel rocket booster, the same engine which powered the Soviet Union's SS-5 missile, said Kenneth Timmerman, director of the Middle East Data Project.

"The Iranians as we speak are in the process of stacking and unstacking missile stages for a test launch later on this summer at the Shahroud missile test centre," he told Reuters.