Explainer-What are Iran’s options to retaliate as open warfare resumes with the US?

Reports indicate that open hostilities between the United States and Iran have resumed, prompting explainer coverage of the retaliatory options available to Tehran. The piece frames this as a fresh escalation rather than a continuation of prior skirmishes, with analysts weighing Iran's conventional and asymmetric tools, including missile strikes, proxy militia action across Iraq, Syria, Yemen, and Lebanon, and potential moves to disrupt shipping through the Strait of Hormuz.

This marks another turn in a long-running standoff that has oscillated between direct confrontation and uneasy deterrence for years. Prior episodes of US-Iran tension have repeatedly raised the specter of Hormuz disruption, given that a substantial share of global seaborne oil trade transits the strait, but actual closures or sustained interdiction have been rare, largely because Iran's own economy depends on maintaining some access to global trade. What appears to have changed here is the description of the conflict as active warfare rather than a war of words or covert strikes, which shifts the baseline market assumption from deterrence to live conflict risk.

The mechanism connecting this to markets runs primarily through energy. Any credible threat to Hormuz shipping lanes tends to push crude oil futures higher on risk premium alone, even absent an actual supply disruption, given the volume of Gulf crude and LNG that passes through the strait daily. Airlines and shippers with Middle East routing exposure face rerouting costs and insurance premium increases. Defense contractors with air-defense, munitions, and naval systems exposure historically see order-flow expectations firm on renewed conflict headlines, while broader risk assets such as equities and emerging-market currencies tend to soften on the uncertainty.