Details have emerged of the surprise letter written by Iranian President Mahmoud Ahmadinejad to US President George W Bush.
In it, Mr Ahmadinejad criticises the US invasion of Iraq and urges Mr Bush to return to religious principles.
US Secretary of State Condoleezza Rice has dismissed the letter, saying it contained nothing new.
The letter was issued as foreign ministers met in New York for talks on the Iranian nuclear crisis.
But after three hours, the ministers failed to agree on a unified position on how to tackle the problem of Iran's atomic programme.
Iraq 'lies'
The letter - thought to be the first from an Iranian president to a US leader since Iran's 1979 revolution - sparked intense interest, coming at a time of acutely tense relations between Washington and Tehran.
The 18-page document has not yet been made public, but according to leaks, Mr Ahmadinejad spoke of the invasion of Iraq, a US cover-up over the 11 September 2001 attacks, the issue of Israel's right to exist and the role of religion in the world.
"On the pretext of the existence of WMDs [weapons of mass destruction], this great tragedy [the US invasion of Iraq] came to engulf both the peoples of the occupied and the occupying country.
"Lies were told in the Iraqi matter," Reuters news agency quoted the letter as saying. "What was the result? I have no doubt that telling lies is reprehensible in any culture, and you do not like to be lied to," Mr Ahmadinejad is quoted as saying.
The president also questioned the creation of the State of Israel, asking "how can this phenomenon be rationalised or explained?", Reuters reported.
In another part of the letter, Mr Ahmadinejad suggests Washington has concealed elements of the truth about the 11 September 2001 attacks on New York and Washington, Reuters reports.
"Why have the various aspects of the attacks been kept secret? Why are we not told who botched their responsibilities?" he asks.
The president ends the letter by appealing to Mr Bush to return to religion.
"We increasingly see that people around the world are flocking towards a main focal point - that is the Almighty God.
"My question for you is, 'Do you not want to join them?'"
Divisions exposed
Washington swiftly dismissed the letter as a ploy, saying it contributed nothing towards helping resolve the stand-off over Iran's nuclear programme.
"It isn't addressing the issues that we're dealing with in a concrete way."
Hours after the letter was sent, Ms Rice held an inconclusive meeting with her Security Council counterparts, as well as that of Germany, on what action to take over Iran.
The BBC's diplomatic correspondent, James Robbins, says that far from drawing the key powers at the UN towards agreement on how to confront Iran, the meeting seems to have exposed the scale of division.
After the meeting, an unnamed senior state department official said prospects for an agreement this week on a UN Security Council resolution were "not substantially good".
However the official said the US was "very satisfied and confident" at this stage.
Germany's Foreign Minister Frank-Walter Steinmeier warned against starting a process which could not be stopped.
"We need to make sure we don't start something we cannot stop and which could get out of control afterwards," Mr Steinmeier was quoted as telling German ZDF television.
Mr Steinmeier said "five or six questions" needed to be resolved before a final resolution could be agreed upon.
Washington has pushed for any resolution to be adopted under the terms of Chapter Seven of the UN Charter.
These are binding on all UN members, but do not automatically lead to sanctions or military action. Further decisions would be needed for such measures.
But China and Russia have resisted such a move, fearing it could lead to a new war.
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