The U.N. nuclear watchdog’s board has condemned Iran for failing to cooperate fully with the agency, the second time it has done so in just five months.

The resolution comes after the agency said Iran has defied demands to rein in its nuclear program and has increased its stockpile of uranium enriched to near weapons-grade levels.

Iran and the IAEA have been at loggerheads on a range of issues including Tehran's failure to explain traces of uranium at two undeclared locations, the barring of some of the agency's leading uranium-enrichment experts and its refusal to facilitate expanded IAEA monitoring.