The build up of naval forces in the Gulf will be one of the largest multi-national naval armadas since the First and Second Gulf Wars. The intent is to create a US/EU naval blockade (which is an Act of War under international law) around Iran (with supporting air and land elements) to prevent the shipment of benzene and certain other refined oil products headed to Iranian ports. Iran has limited domestic oil refining capacity and imports 40% of its benzene. Cutting off benzene and other key products would cripple the Iranian economy. The neo-cons are counting on such a blockade launching a war with Iran.
And if the Russian fleet decides to escort commercial shipping to Iran?