Iran has issued a sharp “final” warning to block a U.S.-backed trade corridor through southern Armenia, part of a peace declaration between Armenia and Azerbaijan announced by Donald Trump. The route would give Azerbaijan direct access to Nakhchivan and Turkey, boosting regional trade while granting the U.S. exclusive development rights. Tehran has flexed military muscle to signal opposition, calling the plan a “graveyard for Trump’s mercenaries.” While analysts doubt Iran’s ability to militarily stop the corridor, tensions are rising across the Caucasus.