By Elwely Elwelly DUBAI, Feb 4 (Reuters) - Iran, which is set to resume nuclear talks with the United States on Friday in Oman, has always warned its formidable ballistic missile program - one of the biggest in the Middle East - is a red line in any negotiations.

The Khorramshahr 4 has a range of 2,000 km (1240 miles) and is capable of carrying a 1,500 kg warhead, Iran's state-run Press TV said.

Estimates show Iran has one of the biggest standing armed forces in the Middle East, along with the largest and most diverse missile arsenal in the region - Anadolu Ajansı

Iran simply cannot maintain total control of its airspace during a US incursion—but its legacy air defense systems are still deadly, and could inflict pain on a reckless attacker.

Israeli defense officials estimate that the entire US-Iran negotiation process is bad for Israel, as it will likely not take Israel's security concerns into account.

Pentagon moves THAAD, Patriot systems to Middle East to protect US forces, Israel and Gulf partners amid concerns over potential Iranian retaliation, says US officials - Anadolu Ajansı

Five months after Israel and the U.S.’ bombardment of Iran’s military and nuclear facilities, Iran claims it now has more missile capacity than even before the 12-Day War. That buildup would have implications far beyond the Middle East: renewed Iranian ...

If President Donald Trump does make the decision to strike Iran, these air defense deployments will give him more options and greater leeway than he had two weeks ago.

Iran’s supreme leader ramped up the rhetoric over a potential military strike from the U.S. over the weekend as tensions are already running high.

Iran's foreign minister states its missile program isn't negotiable as President Donald Trump insists on a nuclear weapons-free deal. Fox News senior strategic analyst Jack Keane weighs in.