United States (US) has removed a wide range of nuclear sanctions against Iran after it has meet its commitments to roll back its nuclear programme. These sanctions were lifted after International Atomic Energy Agency (IAEA) confirmed that Iran has met its commitments under the Joint Comprehensive Plan of Action (JCPA) or Vienna agreement with P5+1 countries signed in July 2015. So called P5+1 countries include the five permanent members of the UN Security Council (UNSC) viz. USA, Russia, China, UK, France and non- permanent member Germany.
US has only removed secondary sanctions on Iran that mainly restricts dealings of other countries with Iran. These lifted secondary sanctions include financial services, banking, insurance, energy and petrochemicals, shipping and ports.