Aaron Arnold, Associate of the Project on Managing the Atom at the Belfer Center, writes in The Diplomat that a key threat to the ongoing implementation of the Iran nuclear deal is the risky nature of the Iranian financial sector. While Iran is banking on receiving greater foreign investment, continued problems with the Iranian financial sector, including lack of sufficient regulatory controls and the potential ties to terrorist financing, have made companies cautious about investing in Iran. He suggests that the United States work with Iran to bring its banking system up to the same standard as the global economy, and to consider closer integration of Iran into the world economy in order to preserve the effects of the nuclear agreement.