"The drawing shown (by Netanyahu) with the red lines was in the first place an insult to the UN general assembly," Ahmadinejad told reporters. "I recommend that he improve his drawing skills."

During his speech at the UN General Assembly last week, Netanyahu literally drew a red line on a cartoonish drawing of a bomb to show the stage at which Iran would have enough highly enriched uranium to assemble one nuclear bomb.

Israel views a nuclear-armed Iran as an existential threat. It has said all options, including military strikes on Iran's nuclear sites, remain on the table to stop Iran from going nuclear.

Iran denies Western suspicions that it is secretly seeking a nuclear bomb, saying its atomic programme is peaceful.

Also on Tuesday, Ahmadinejad said Iran would stop the 20 per cent uranium enrichment process if the needed uranium was provided from abroad.

"The 20 per cent enriched uranium is only used for medicaments (at the medical reactor in Tehran) and has no other use for us," Ahmadinejad told reporters in a press conference in Tehran.

The president said that as the 20 per cent enrichment process was expensive, Tehran was asking to either purchase it from abroad, or exchange 3.5 per cent enriched uranium with 20 per cent for Tehran's medical reactor.

"We wanted this back then (2010) and we want it now ...back then it was not accepted and for now, so far we have not received any offers," Ahmadinejad said.

The president was referring to an agreement made in 2010 between Iran, Brazil and Turkey under which Tehran would store its low-enriched uranium in Turkey and exchange it with 20 per cent uranium from abroad.

Ahmadinejad has described any Israeli attack on Iran as an "adventure."

"We are not afraid of threats made by the uncivilized Zionists (Israel) and neither are we afraid of their firecrackers," he said. "I consider any adventure in Iran a mistake."