In the second half of 2019, after the U.S. withdrew from a landmark nuclear agreement with Iran and set out to wreck its economy, Tehran took modest steps violating the accord. After the U.S. killed the country’s most prominent military commander in a drone strike in Baghdad Jan. 2, Iran’s government said it was no longer bound by any of the atomic limits imposed by the deal. While officials stressed its nuclear sites remain open to international inspectors and said their decision was reversible