Iran threatened the United States with ‘economic warfare’ and said it had fired an advanced missile at US warships, underscoring the risks of further escalation in the war only days after both sides traded blows again ↧ Iran says it plans new Gulf 'exclusion zone', threatens US with new... Iran threatened the United States with "economic warfare" on Tuesday and said it had fired an advanced missile at U.S. warships, underscoring the risks of further escalation in ​the war only days after both sides traded blows again.