Iran’s missile program originated during the 1980–88 Iran–Iraq War as a means to deter Iraqi Scud attacks during the War of the Cities and compensate for its lack of modern air power.[11] In 1984, Iran obtained its first ballistic missiles (20 Soviet “Scud-B” SRBMs) from Libya[12] and subsequently procured Scud derivatives and launchers from North Korea and China. By the 1990s, Iran had reverse-engineered Scud technology to produce the Shahab-1 (a range of 330 km) and Shahab-2 (a range of 500 km) missiles, as well as Zelzal and Fateh short-range rockets. In the 2000s, Iran introduced longer-range systems (e.g. the liquid-fueled Shahab-3 MRBM) and began testing two-stage solid-fueled designs (e.g. the Sejjil-2 MRBM). Key milestones include the public debut of Shahab-3 in 1998 (a range of ∼1,300 km) and the solid-fuel Sajjil in 2008. By 2010, Iran was unveiling newer variants (e.g. Qiam-1 in 2010, Zolfaghar in 2016) and integrating missile tests with its growing space launch program. Throughout this period the program’s drivers included deterrence of Israel and Arab states of the Persian Gulf, asymmetrical warfare doctrine, and prestige, as summed up by experts: “Iran’s ballistic missile programme… is an important element of military doctrine, a means of deterrence, and a tool of statecraft”.[12][13]
Shahab-3 - Wikipedia ser ut som siden 2003? 
Iran in the early 2000s may have explored various fuzing, arming and firing systems to make the Shahab-3 more capable of reliably delivering a nuclear warhead.[1]
