The U.S. is organizing support at the U.N. for hefty new sanctions meant to cripple Iran's Revolutionary Guards.

Western nations want Iran to halt its uranium enrichment program and negotiate the future of its nuclear program. Russia has signaled that it will go along. But China is warning that it could block action in the UN Security Council, saying diplomacy should be given more time to work.

Sanctions against Tehran were last enacted in 2006. Iran recently announced that it will build 10 new enrichment facilities.