The U.S. and Iran have completed a prisoner swap, which also unlocked $6 billion in oil funds that the U.S. was holding from Iran. This could potentially lead to improved relations between the two nations and impact the oil sector. The U.S. has agreed to unfreeze $6 billion in Iran's name which was held in South Korea. The money came from the purchase of Iranian oil by South Korea in 2018. The U.S. sanctions that have accumulated since 1979 bar U.S.-based companies from investing in Iran's oil industry. If U.S.-Iran talks improve and the countries return to talks of a new nuclear deal, the U.S. would remove sanctions, potentially impacting oil and energy ETFs such as iShares U.S. Oil & Gas Exploration & Production ETF (BATS:IEO), ProShares Ultra Bloomberg Crude Oil (NYSE:UCO), Invesco DB Oil Fund (NYSE:DBO), and iShares US Oil Equipment & Services ETF (NYSE:IEZ).