Sanctions against Iran
There are two parallel systems of sanctions with different focuses concerning Iran.
Sanctions concerning nuclear technology
Sanctions concerning human rights
The first goes back to UN Security Council resolutions and comprises measures in connection with suspicions that Iran is building up a capacity to develop nuclear weapons and delivery vehicles for nuclear weapons systems. Since 2007, the UN's decisions have been implemented and further developed within the EU.
The second system of sanctions was independently decided upon by the EU. It was introduced in 2011 and comprises measures in connection with the worsened human rights situation in Iran.
Both systems are described separately under the links above.