US criticises Iran satellite rocket tests

Iran's Revolutionary Guards has tested a new satellite-carrying rocket, state media reports, a move the United States called "unhelpful and destabilising".

Washington fears the same long-range ballistic technology used to put satellites into orbit could also be used to launch nuclear warheads. Tehran has regularly denied having any such intention.

"The flight test of this satellite carrier with a solid-fuelled engine ... was successfully completed," state news agency IRNA reported on Saturday.

The Ghaem 100, Iran's first three-stage launch vehicle, would be able to place satellites weighing 80 kg in an orbit 500 km from the earth's surface, IRNA said.

Amirali Hajizadeh, head of the Revolutionary Guards' aerospace division which developed the Ghaem 100, said the rocket would be used to launch Iran's Nahid satellite for the telecommunications ministry, state media reported.

Saturday's operation tested the first sub-orbital stage of the rocket, the reports said.

In an emailed response to the Iranian announcement, a spokesperson for the US State Department said: "Such actions are unhelpful and destabilising."

"The United States remains concerned with Iran's continued development of space launch vehicles (SLVs), which pose a significant proliferation concern," the spokesperson said.

"SLVs incorporate technologies that are virtually identical to, and interchangeable with, those used in ballistic missiles, including longer-range systems."

The official said launches of SLVs "defy United Nations Security Council Resolution (UNSCR) 2231, which calls upon Iran not to undertake any activities related to ballistic missiles 'designed to be capable of delivering nuclear weapons, including launches using such ballistic missile technology.'"

Washington "continues to use a variety of non-proliferation tools, including sanctions, to counter the further advancement of Iran's ballistic missile program and its ability to proliferate missiles and related technology to others," the spokesperson added.

Iran, which has one of the biggest missile programs in the Middle East, has had several failed satellite launches in the past few years, blamed on technical issues.

The 2015 UN resolution called on Iran to refrain for up to eight years from work on ballistic missiles designed to deliver nuclear weapons following an agreement with six world powers.

Iran says it has never pursued the development of nuclear weapons and, therefore, the resolution does not apply to its ballistic missiles, which Tehran had described as an important deterrent and retaliatory force.

Then-president Donald Trump pulled the United States out of the nuclear deal in 2018. President Joe Biden's administration had been seeking to negotiate Iran's return to the pact but recently said it had set aside diplomacy for now because Tehran had supplied drones to Russia for use in its war against Ukraine.