In a new challenge to the international community, the spokesman of Iran’s Atomic Energy Organization Bahruz Kamalundi announced on Monday that Iran has increased four times ,its production of the 3.67 percent enriched uranium .

“Following the recent decision of the Supreme National Security Council, Iran has increased its production of enriched uranium,” Kamalundi told a news conference, quoting the director of the Natanz uranium enrichment site.

According to the White House, Iran had before July 2015 a large stockpile of enriched uranium, and about 20 thousand centrifuges, which is enough to produce between 8 to 10 nuclear bombs.

At the time, US experts estimated that if Iran decided to produce a nuclear weapon it would have only two or three months to get enough enriched uranium (up to 90 percent), the amount needed to produce the bomb.

After four years of relative change under an agreement signed by Iran with the five permanent members of the United Nations Security Council (the United States, Britain, France, China and Russia), as well as Germany, Iranian President Hassan Rowhani on Wednesday threatened to resume uranium enrichment and not sell his country enriched uranium And heavy water to other countries.

The signatories were given 60 days to choose between two things, either to fulfill their financial and oil obligations under the agreement, or to follow the United States and withdraw from the agreement.

The agreement calls on Iran to sell its surplus enriched uranium abroad, rather than retaining it. By selling it abroad, Iran can generate nuclear power, and other parties to the deal can make sure it does not develop nuclear weapons.

Under the nuclear deal in 2015, Tehran agreed to limit its stockpile of enriched uranium, used to make reactor fuel and nuclear weapons, for 15 years and reduce the number of centrifuges for 10 years.

According to the deal, Iran has cut its98 percent uranium stockpile to 300 kilograms for 15 years and has agrred to a controlled level of enrichment of 3.67 percent, but it seems that it is enough for Iran to make nuclear bombs.

Iran has established two uranium enrichment plants, Natanz and Fordo, where centrifuge stations have been fed uranium hexafluoride gas to separate more fragmented U235.

Low enriched uranium, with a concentration of U235 ranging from 3 to 4 percent, can be used to produce fuel for nuclear power plants, but it can also be enriched to the 90 percent required to produce nuclear bombs.