Iran's Supreme Leader Mojtaba Khamenei has warned the United States and Israel against launching fresh attacks, threatening an immediate military response as concerns grow over a possible return to war.

The warning comes as US Secretary of State Marco Rubio says President Donald Trump has yet to decide whether to order further strikes on Iran. Tehran, meanwhile, has ruled out immediate direct talks with Washington, despite ongoing mediation efforts involving Qatar and Pakistan.

With both sides maintaining their positions, regional leaders are urging restraint as uncertainty grows over what could happen after the US midterm elections.

Eight months of war leave tensions unresolved

The conflict began in February with US and Israeli strikes on Iran that killed the country's then Supreme Leader, Ayatollah Ali Khamenei.…