As early as 1950s, Iran had set foot in the nuclear field. At that time, the ambitious King Pahlavi tried to take advantage of the close relationship with the United States and other western countries to fully implement the nuclear program. 1957 Iran and the United States signed an agreement on the peaceful use of nuclear energy, marking the official start of Iran's nuclear program. 1979 When the Pahlavi regime collapsed, Iran had signed agreements with foreign countries for six nuclear power plants, of which the Bushehr nuclear power plant built with the help of West Germany had completed most of the construction projects. Iran in Pahlavi era has been striving to become the first Islamic country with nuclear deterrent. From the end of 1970s to the end of 1980s, Iran's nuclear program was in a period of temporary stagnation. Since 1990s, Iran's nuclear program has been completely restarted. 1992, Iran and Russia signed an agreement on the peaceful use of nuclear energy, marking a new stage of Iran's nuclear program. According to the information disclosed by western intelligence agencies, after decades of efforts, Iran's nuclear program has made breakthrough progress and initially established a complete nuclear fuel cycle system. [1] At the same time, Iran is also vigorously developing its own missile system. 1998, Iran successfully launched the "shehab -3" ballistic missile with a range of 1300 km, which can reach Israel, demonstrating Iran's own weapons research and production capacity and strengthening its strategic deterrence in the Gulf region and even the Middle East. Iran is also developing shehab -4 ballistic missile and shehab -5 intercontinental missile with a range of 2,000 kilometers.

The development of Iran's military power, especially the nuclear issue, has aroused serious anxiety in the United States. Since the Islamic Revolution in Iran overthrew the pro-American Pahlavi dynasty in 1979, the relationship between the United States and Iran has been at a "freezing point". Iraq accuses the United States of supporting Israel in engaging in state terrorism, occupying Arab territories and pursuing global hegemony, and is the "biggest devil" in the world. The United States accused Iraq of supporting terrorism. The United States believes that "Iran is the country that supports terrorism most in the world" [2] "It opposes the Arab-Israeli peace process, supports regional and international terrorism, and strives to make nuclear weapons, which makes it a threat not only to neighboring countries, but also to the whole region and the world." [3] After taking office, President George W. Bush called Iran, Iraq and North Korea "axis of evil" in his State of the Union address.

As early as the 1980s, the United States was very concerned about Iran's nuclear facilities, and it also accused Iran of seeking to develop nuclear weapons. Especially after 1995, Iraq and Russia signed an agreement to build Bushehr nuclear power plant, the United States was on pins and needles, worried that Iraq would develop nuclear weapons one day, and repeatedly urged Russia to suspend its nuclear cooperation with Iraq, but to no avail. After the Iraq war, the United States accused Iran of developing nuclear weapons and constantly put pressure on Iran directly or through the International Atomic Energy Agency, the European Union and Russia. US Deputy Secretary of State for Arms Control and International Security Bolton even threatened that the United States reserved the right to use military means to prevent Iran from developing nuclear weapons. The United States strengthened its nuclear supervision over Iraq through the International Atomic Energy Agency, saying that Iraq was secretly developing nuclear weapons. Israel also claimed that Iraq could produce nuclear weapons in 2005 or 2006, and threatened to strike it militarily.

In 2008, with the change of international situation and the rise of oil price, Iran has been able to produce "industrial scale" nuclear fuel.

Ahmadinejad told hundreds of senior Iranian officials and journalists present that "from today, Iran has joined the ranks of countries that can produce nuclear fuel on an industrial scale".