UN watchdog: Iran now in violation of heavy water limits

The U.N.’s nuclear watchdog says Iran has breached another limit of the 2015 nuclear deal with world powers by stockpiling more heavy water than allowed

Heavy water helps cool reactors, producing plutonium as a byproduct that can be used in nuclear weapons. Iran insists that its nuclear program is for peaceful purposes.

Tehran has been slowly stepping up violations of the nuclear deal to pressure world powers to provide more incentives to make up for the U.S. withdrawal from the deal last year and renewed American economic sanctions.