Earlier in the day, Vienna hosted a meeting of the Joint Commission of the Joint Comprehensive Plan of Action (JCPOA) between the P5+1 group of countries (comprising Russia, China, France, the United Kingdom, the United States and Germany) and Iran.
According to the ISNA news agency, Araghchi also held meetings with a representative of China and other states.
On July 14, 2015, Iran and the P5+1 group signed the JCPOA to ensure the peaceful nature of Iran’s nuclear program. Under this agreement, Iran pledged to not seek to develop or acquire nuclear weapons in exchange for the lifting of sanctions imposed against Iran.
US President Donald Trump has repeatedly criticized the agreement: in January, he said he was "waiving" the application of certain sanctions, but only so that the European parties to the deal could work on improving it.