Iran has dramatically slowed accumulating near-weapons-grade enriched uranium and diluted some of its stockpile, according to a Wall Street Journal report Friday. The moves could further ease tensions with the U.S. and allow the resumption of broader talks over its controversial nuclear program. The news comes a day after Iran released four jailed American citizens into house arrest, paving the way for a planned prisoner swap that will eventually send them home. A fifth American is also part of the deal. In exchange, Iran will gain access to billions of dollars of oil revenues trapped in South Korea under U.S. sanctions.