Iran's Economy Minister has warned that any international efforts to punish his country for resuming nuclear fuel research may lead to higher oil prices.
Iran is under growing pressure to stop its nuclear research
Sanctions could upset "Iran's political and economic situation" leading to oil prices "beyond levels the West expects", Davoud Danesh-Jafari said.
Iran denies it plans to develop nuclear weapons but has said it will not be intimidated by international pressure.
The country is the world's fourth largest exporter of crude oil.
Concerns over Iran and continuing unrest in Nigeria pushed up crude oil prices on Monday.
Brent crude for March delivery rose 65 cents to $63.25 a barrel in London although the impact was limited by the closure of US markets for a public holiday.
IRAN'S NUCLEAR STAND-OFF
Sept 2002: Work begins on Iran's first reactor at Bushehr
Dec 2002: Satellites reveal Arak and Natanz sites, triggering IAEA inspections
Nov 2003: Iran suspends uranium enrichment and allows tougher inspections
June 2004: IAEA rebukes Iran for not fully co-operating
Nov 2004: Iran suspends enrichment under deal with EU
Aug 2005: Iran rejects EU plan and re-opens Isfahan plant
Jan 2006: Iran re-opens Natanz facility
Mr Danesh-Jafari's comments on Iranian state radio came as the five permanent members of the United Nations Security Council and Germany met in London to discuss Iran's move to resume its nuclear fuel research.
The US, Britain, France, Russia, China and Germany intend to discuss their strategy - including the possibility of sanctions - following the resumption of Iranian nuclear research.
President George Bush has also refused to rule out military force - a view backed by politicians from both main parties in the US.
World oil prices rose above $64 a barrel last week as hopes of a diplomatic solution to the growing international stand-off with Iran began to fade.