U.N. nuclear watchdog chief Rafael Grossi said on Wednesday he hopes Iran's move towards capping its stock of uranium just short of weapons grade will hold, as his agency's board was set to pass a Western-drafted resolution that could derail that.

A report from the United Nations' nuclear watchdog reportedly says Iran further increased its stockpile of uranium enriched.

Iran has raised the possibility it would stop expanding its stockpile of uranium enriched to a purity of 60 percent — very close to the level needed for a weapon, the U.N.’s nuclear watchdog says.