U.S. Secretary of State John Kerry said on Wednesday that the U.S. has met its sanctions relief obligations to Iran under last year’s nuclear deal; however, is willing to further clarify the issue.

“We have lifted the sanctions we said we would lift and we have completely kept faith with both the black-and-white print as well as the spirit of this effort. In fact, I have personally gone beyond the absolute requirements of the lifting of sanctions to personally engage with banks and businesses and others who have a natural reluctance after several years of sanctions to move without fully understanding what they are allowed to do and what they are not allowed to do,” ABC News quoted Kerry as saying after a meeting with Iranian Foreign Minister Mohammad Javad Zarif in Oslo, Norway.

The U.S. secretary of state said that there are limits on what the U.S. can do to encourage businesses to deal with Iran.

Kerry said he believed there were areas where the U.S. could do more to show it is a good faith negotiating partner.

“I think there are places where the United States could give confidence where there is doubt,” Kerry said. “And, I feel that it is important for us if we’re going to have future dealings (with Iran) or we want to have a reputation for good faith in negotiations we conduct anywhere. It’s important for us to show good faith in executing this agreement and I intend to see to it that we do that.”

Iran and the 5+1 group - the United States, Britain, France, China and Russia plus Germany - finalized the text of the Joint Comprehensive Plan of Action (JCPOA) in Vienna in July 2015. The nuclear deal went into effect in January 2016.

Iran has urged the U.S. to take more serious steps in order to ally international banks’ concerns over resuming ties with Iran.