You cannot wage economic war against the Islamic Republic without paying a price.
US officials believe that was the message delivered by two explosions on two oil tankers in the Gulf of Oman.
Since pulling the US out of the Iranian nuclear deal in 2015, Donald Trump's Administration has pursued a "maximum pressure" economic sanctions policy against Iran in a bid to force it to accept more intrusive restrictions on its nuclear activities.
President Hassan Rouhani and his Foreign Minister Javad Zarif have been working to in their words "save" the deal they championed.
Ultimate power in Iran lies with Supreme Leader Ayatollah Ali Khamenei. He can fire presidents and ministers, veto laws and directs foreign and security policy. He is the real commander in chief.