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Iran expert Soraya Lennie tells Euronews: "I really don't see a lot of positive avenues left open to de-escalate this crisis.
US President Donald Trump on Friday approved sending American troops to bolster Saudi Arabia’s air and missile defences after the September 14 attacks on Saudi oil sites.
Drone strikes on key Saudi oil installations last Saturday have reduced the flow of the world's oil supplies by about five percent.
An Iranian oil tanker seized on suspicion of illegally shipping oil to Syria will not be detained by Gibraltar despite a US warrant to seize it.
The Iranian Intelligence Ministry said at a press conference on Monday that it had identified and arrested 17 spies acting on behalf of the US Central Intelligence Agency (CIA).
Trump said the U.S.S. Boxer "took defensive action" against an Iranian drone over the Strait of Hormuz.
Iran seized a foreign vessel with 12 crew accused of smuggling fuel in the Gulf, state television quoted Iran's Revolutionary Guards as saying on Thursday.
NBC News could not independently confirm the reports and the CIA said it had no comment.
President Donald Trump has threatened Iran with "obliteration" if it strikes "anything American" after Tehran dismissed new U.S. sanctions as "useless."
The president spoke about his decision-making in an exclusive interview with NBC's Chuck Todd for "Meet the Press."
The businessman was held for almost four years, accused of spying.