Trump pledges 'economic warfare' on Iran, prompting Tehran derision

US President Donald Trump pledged "economic warfare" against Iran and threatened any country that trades with it, prompting Iran to dismiss the plan on Thursday as a continuation of failed policies. The war between the two countries, started by the US and Israel in February, appears stalemated, with peace talks stalled, Tehran keeping the key Strait of Hormuz shut and Washington persisting with a naval counter-blockade of Iran.