Tehran: Iran's Supreme Leader Ayatollah Ali Khamenei on Tuesday ruled out negotiations with the US "at any level", as tensions mounted between the arch-foes after Washington blamed Tehran for attacks on Saudi oil installations.

Khamenei said the US adopted a policy of "maximum pressure" on Iran because it believes it cannot bring it to its knees through other means. "The policy of 'maximum pressure' against the Iranian nation is worthless," he said in a televised address. Khamenei said if the US "repents" and returns to the Joint Comprehensive Plan of Action, then it can talk with Iran along with other parties to the deal.