The first orchestrated rollback in Western antinuclear economic sanctions against Iran took effect on Monday under Tehran’s temporary agreement with world powers, as all sides reported that the steps initially promised had been fulfilled.

Under the temporary agreement, Iran began suspending most advanced uranium-fuel enrichment and halted other sensitive elements of its nuclear program. In exchange, it received what the United States called “limited, targeted and reversible sanctions relief for a six-month period.”

The agreement, known in diplomatic language as the Joint Plan of Action, expires on July 20 and was intended to give Iran and the so-called P5-plus-1 powers, which are the five permanent members of the United Nations Security Council — Britain, China, France, Russia and the United States — plus Germany, more time to negotiate a permanent accord.

The goal is to resolve peacefully the longstanding dispute over Iran’s nuclear energy program, which Iran has called peaceful and legal but the Western countries and Israel have described as a guise to achieve the ability to produce nuclear weapons.