The Islamic Republic of Iran’s vast missile system is the brainchild of the U.S.-designated state-sponsor of terrorism, the communist North Korea regime, which works hand in glove with Iran, according to one of the world’s leading experts on the Iran-North Korea strategic alliance.

“The missile launched at Diego Garcia was a Musudan. The Iranians bought 19 of these from the North Koreans and took delivery in 2005. They have had this capability since 2005 — and this is no ‘secret weapon,’” Bruce Bechtol, who co-authored with Anthony Celso the groundbreaking book “Rogue Allies: The Strategic Partnership Between Iran and North Korea,” told Fox News Digital.

Fox News Digital reported last week that Iran significantly escalated its war effort against the U.S. with its launch of two intermediate-range ballistic missiles toward Diego Garcia—roughly 2,500 miles from Iran.

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Bechtol said, “The most important threat from Iran as the war with the United States and Israel has evolved has been the ballistic missiles, launched not only at U.S. facilities and Israeli cities, but also at neighboring Islamic countries. Thus, it is important to consider this capability and where Iran got it.”

He said, “The short-range ballistic missiles that Iran has launched at key U.S. facilities and at neighboring Arab states include a key system – the ‘QIAM.’ The QIAM was developed and improved with North Korean assistance… North Korea has proliferated a lot to Iran that we are seeing right now in the war.”

The joint U.S.-Israeli war against Iran’s regime, the world’s worst state-sponsor of terrorism, according to the U.S. State Department, has entered its fifth week.

Bechtol, who is a professor of political science in the Department of Security Studies at Angelo State University in Texas, noted that, according to the Wisconsin Project, North Korea had constructed a large missile test facility at Emamshahr, a city in the Fars Province in Iran, and a tracking facility at Tabas in South Khorasan province.

He said North Korea aided Iran with crucial technology “for targets farther away from Iran.”

“The North Koreans proliferated around 150 No Dong systems to Iran in the late 1990s. The Iranians were apparently very happy with the missiles the North Koreans provided them, and, following the earlier precedent of the Scud C factory, contracted with Pyongyang to build a No Dong facility in Iran.”

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Bechtol continued, “The Iranians called this ‘new’ missile the Shahab-3. The Shahab-3 is almost an exact copy of the No Dong. Once the Shahab-3 was up and running, the North Koreans moved forward with the Iranians in improving its range and lethality.”

He said, “With assistance from the North Koreans, the Iranians were then able to produce (at the No Dong facility) the Emad and the Ghadr. The Emad has a range of 1,750 kilometers (approx 1,087 miles) and the Ghadr has a range of 1,950 kilometers (approximately 1,212 miles.) The Iranians have used these two systems to target not only Israel, but their Arab neighbors (including U.S. bases located in these countries) throughout the ongoing first stages of this conflict.”

Bechtol said the North Koreans spawned an Iranian missile warhead that weighs a ton and a half to two tons on the powerful Khorramshahr-4. “There is another system capable of hitting Israel that has been even more lethal than any of the systems described thus far. This system is called the ‘Khorramshahr,’ and the fourth version of this system, appropriately called the ‘Khorramshahr-4,’ has been proven to carry a warhead larger than any other in Iran’s missile inventory, armed with what appears to be cluster munitions,” he said.

He described the strategic partnership, noting: “North Korea is the seller and Iran is the buyer. North Korea proliferates weapons systems, technology, parts and components, technicians, engineers and specialists and military capabilities (such as the building of underground facilities) to Iran. Iran pays North Korea with cash and oil. Simple as that.”

Bechtol said the only way to stop this is through sanctions enforcement against North Korea. “The sanctions that are needed are already on the books. But the USA and our key allies need to robustly enforce them. We need to go after banks, front companies and cyber entities in order to squeeze the money and contain or destroy the supply chain.”

He said, “More emphasis needs to be placed, and more action needs to be taken using the Proliferation Security Initiative — an underused aspect of preventing North Korea’s arms from flowing to rogue nations and terrorist groups.  If you cut off the supply chain, you cut off the proliferation.”