The US-Iran conflict has escalated as Iran's Revolutionary Guards assert control over the strategic Strait of Hormuz, warning any approaching US military vessels of 'decisive action'.
US President Donald Trump announced plans to shut off the strait, but Iran asserts full control, with shipping activity already affected.
Despite failed Islamabad peace talks, fresh Iran-US talks are expected on Thursday, with the US proposing a 20-year suspension of nuclear activity, while Iran suggests a five-year suspension.
The US has 16 warships in the Middle East, including the USS Abraham Lincoln, but military officials have offered few details on how a blockade of Iranian ports would work.
