"Any attack against infrastructure in Iran will provoke an even stronger response," state television quoted Foreign Minister Abbas Araghchi as saying.

He spoke after Israel said it was preparing a response to Iran's October 1 missile attack on its arch-enemy, its second on the country in six months.

On Monday, an official statement quoted Araghchi as saying Iran did not seek war in the region.

On Friday US President Joe Biden cautioned Israel against attacking oil installations in Iran, one of the world's top 10 producers of crude.

Islamic Revolutionary Guard Corps General Rassul Sanairad warned Israel on Sunday any attack on nuclear or energy sites would cross a "red line".

The Fars news agency quoted him as saying following the Israeli threat: "Some political leaders have spoken of a possible change in Iran's nuclear policy."

In 2022, after an official said Iran had the technical capability to produce a nuclear weapon, the country stressed there had been no change in its nuclear ambitions.

Last year Iran slowed the pace of its uranium enrichment, but then in late 2023 accelerated the production of 60 percent enriched uranium, according to the International Atomic Energy Agency.

Enrichment levels of around 90 percent are required for military use.

Iran has always denied any ambition to develop a nuclear weapons capability, insisting its activities are entirely peaceful.

Any attack on Iranian nuclear sites "would have an impact on the kind of response by Iran", General Sanairad said.

Tehran says its attack on Israel, when some 200 missiles were fired, was a response to the death in a Beirut air strike of Hassan Nasrallah, leader of the Iran-backed Lebanese movement Hezbollah, and of Hamas political leader Ismail Haniyeh in Tehran.

Iran blamed Israel for Haniyeh's death, but Israel has not commented.