Iran has dismissed US claims it is trying to influence the situation in post-war Iraq.
The United States claims the Islamic nation is developing nuclear weapons and is giving refuge to top al-Qaeda fugitives.
An Iranian foreign ministry spokesman told reporters today: "We are determined not to interfere in Iraq's internal affairs and impose a government on the Iraqi people or say what kind and model of government they should have".
US administrator Paul Bremer yesterday claimeed "troubling" Iranian activity in Iraq which he said could result in serious problems if it went too far.
Tehran backs Shi'ite Muslim groups in Iraq, many of whose leaders fled the rule of Saddam Hussein for exile in Iran.
US Defence Secretary Donald Rumsfeld has said Washington would not let Tehran try to foster Iranian-style rule in Iraq.
The Iranian spokesman said: "It depends on the Iraqi nation and they should choose the model of government they want. Whatever they choose we will accept it and respect it".
The United States broke diplomatic ties with Tehran after the 1979 Islamic revolution and brands Iran as part of an "axis of evil".
Iran has accused the United States of double standards in fighting terrorism by refusing to hand over People's Mujahideen Iranian rebels disarmed by US forces in Iraq.
While branded as terrorists by the US State Department, analysts say Pentagon hawks are mulling whether to use the group against Iran.