Iranian President Mahmoud Ahmadinejad has said Iran should not show weakness over its nuclear programme.
In the past, he said, compromise over the programme, which Tehran says is intended solely for peaceful power supplies, had led to increased demands from the West.
The five permanent members of the UN Security Council and Germany will meet in London on Monday to begin drafting a second sanctions resolution on Iran over its nuclear activities.
The move follows a report by the UN nuclear agency, the International Atomic Energy Agency, which found that Iran has failed to meet a 60-day deadline to suspend uranium enrichment.
Analysts say attempts to impose harsher sanctions could face serious obstacles, as Russia, China and some EU countries want further dialogue with Iran as opposed to the US policy of isolating the country.
Last night Iran's ambassador to the IAEA, Ali Asgar Soltaneih, said his country would not be suspending enrichment.
