The threats are being ramped up over a vital oil shipping route which Iran's threatening to block. Tehran is holding large-scale wargames in neutral waters near the Hormuz Strait. The U.S. has its own contingent in the region, mainly to ensure passage remains free. Gayane Chichakyan is in Washington for RT. Also, Shirin Shafaie joins RT - a researcher at the School of Oriental and African Studies in London, and also a representative of the Campaign against Sanctions and Military Intervention in Iran.