Iran's Supreme Leader Ayatollah Ali Khamenei said on Thursday that nuclear negotiations with world powers had revealed U.S. enmity towards the Islamic state.
Khamenei was speaking hours before the resumption of talks between Iran and the European Union in Geneva.
"We had announced previously that on certain issues, if we feel it is expedient, we would negotiate with the Satan (the United States) to deter its evil," Khamenei told a gathering, reported by the official Islamic Republic News Agency.
"The nuclear talks showed the enmity of America against Iran, Iranians, Islam and Muslims," he said. Khamenei also accused the U.S. of human rights violations, citing the drone strikes in Afghanistan and Pakistan, as well as the Guantanamo Bay prison facility.
Talks between Iran and the EU started in Geneva on Thursday to discuss the practical details of implementing a nuclear agreement reached in Geneva in November, an EU spokeswoman in Brussels said.
Meanwhile, Iranian President Hassan Rouhani and Russian President Vladimir Putin spoke on the phone on Thursday. The two discussed the ongoing civil war in Syria as well as the interim deal struck between Iran and the West over its nuclear program.
There are concerns that the current interim deal is not worth much anymore. The stated goal of the interim agreement was to stop Tehran's development of its nuclear program for six months, until a final deal is reached.
Officials involved in the talks have stated that new information regarding centrifuges in Iranian nuclear compounds will be one of the main focuses in the talks that began Thursday.
Iran recently claimed it has installed new centrifuges, with Iranian Atomic Energy chief Ali Akbar Salehi confirming that his country is developing a new generation of centrifuges for uranium enrichment.