>> They've called US President Donald Trump crazy and accused him of beating the drums of war. Iran's powerful Revolutionary Guards are showing they have no intention of curbing their activities in the Middle East, after a blistering speech earlier this month lashing out at them.>> Our policy is based on a clear right assessment on the Iranian dictatorship, its sponsorship of terrorism, and its continuing aggression in the Middle East and all around the world.
>> Iran's Shiite militia proxies have made formidable military gains in recent months. And, after the Trump speech, helped recapture the oil-rich city of Kirkuk. Reuters' senior correspondent, Babak Dehghanpisheh, says Iran has become a frontline player in the region.>> The guards are really at the peak of their power in the Middle East right now.
They've used the instability in Iraq and Syria to expand their military and political cooperation with these two countries.>> US Secretary of State Rex Tillerson also ramping up those tensions on Sunday.>> The Iranian militias that are in Iraq now that the fight against Daesh and Isis is coming to a close Those militias need to go home.
>> Tillerson also warning global firms not to do business with the guards.>> The ramping up tensions is quite dangerous at the senior levels probably on both sides, in Iran and the US. They are not looking for an open conflict, open warfare between the two countries. But when tensions are this high, when the rhetoric is this heated, chances are that mid-level, lower level commanders could make mistakes and that could lead to a clash.
And particularly in the Gulf in recent months there's been quite a bit of tension, there have been Iranian Revolutionary Guard Navy boats that have buzzed around American large warships. And the US has had to fire warning shots.>> Experts say one thing is clear, Iran's powerful guards don't back down from a fight.