U.S., Britain, and Canada imposed significant steps to cut Iran off from the international financial system, announcing coordinated sanctions aimed at its economics. The measures, a response to a recent United Nations report warning about Iranâ€™s nuclear activities, tighten the vise on Iran but still fall short of a blanket cutoff. The combined actions were a show of resolve in the face of a report earlier this month by the U.N. nuclear agency that voiced serious concerns that Iran, despite its denials, is seeking to acquire nuclear weapons. U.S. sanctions target Iran’s oil and petrochemicals industry and Iranian companies involved in nuclear procurement or enrichment activity. The U.S. also declared Iran’s banking system a center for money laundering – designed as a stern warning to financial institutions around the world to think twice before doing business with Tehran.