Iran’s Foreign Minister Mohammad Javad Zarif and US Secretary of State John Kerry held a meeting in Montreux, Switzerland on Monday.
The meeting was also attended by Iran's deputy FMs and US under secretary of state, Iran’s head of Atomic Energy Organization Ali-Akbar Salehi, US Energy Secretary Ernest Moniz and President Rouhani’s special aide Hossein Fereidoun.
The Iranian and American negotiators met for 2.5 hours on Monday.
Speaking at the end of the first day of talks on Monday, Zarif said the negotiations offered an opportunity to discuss political matters.
"This round of nuclear negotiations is a good chance for the two ministers to discuss political matters, particularly the immediate removal of sanctions,” Zarif said.
The talks between Iran and the P5+1 were extended until June 30, 2015 to reach a comprehensive nuclear agreement. However, the sides attempt to reach a political accord in March.
After the parties failed to meet the Nov. 24, 2014 deadline they also extended the Geneva nuclear deal, which was signed in November 2013 for providing Iran with some sanctions relief in exchange for Tehran agreeing to limit certain aspects of its nuclear activities.