U.S. will collapse Iran's economy by shutting down its oil industry, Treasury secretary says / US imposes new sanctions on Chinese and Indian firms for helping Iran oil sales / State, Treasury Departments reimposes 'maximum pressure' sanctions on Iran's oil trade / Development of North-South corridor to be engine of Russia-Iran trade -- Iranian expert / Dutch law firm helped Iranian oil industry evade U.S. sanctions for years / U.S. crude prices fall more than 4% as Israel is not expected to strike Iran's oil industry / Petroleum Division says import of oil from Iran through barter trade possible / Malaysian maritime authorities too stretched, underfunded to stem trade in US-sanctioned Iran oil, observers say / Oil smuggling from Iran forcing refineries to drastically reduce production / Iran oil exports hit 6-year high as west prepares sanctions