Emerging outlines of a deal between Washington and Tehran to end their war contain a stinging paradox: sweeteners to coax Iran into compliance may strengthen an adversarial force that the U.S. and its Western allies consider a terrorist organization.

For years, Iran¡¯s Revolutionary Guard thrived in the shadow of sanctions, building a sprawling commercial empire stretching from oil and construction to shipping, telecommunications and ports.

Now, as Tehran and Washington prepare for talks on a deal to end the war that could unlock billions of dollars ?for Iran and reopen its economy to global investment, the elite force is poised to be one of the biggest beneficiaries.