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(Reuters) - Iran complained to the United Nations on Tuesday over what it called a U.S. threat to attack it with atomic weapons, accusing Washington of nuclear blackmail in violation of the U.N. charter.

President Barack Obama made clear last week that Iran and North Korea, both involved in nuclear disputes with the West, were excluded from new limits on the use of U.S. atomic weapons.

A letter from Iranian Ambassador Mohammad Khazaee to U.N. Secretary-General Ban Ki-moon and the Security Council and General Assembly presidents called on the United Nations to "strongly oppose the threat of use of nuclear weapons and to reject it."

Statements by Obama and other U.S. officials were "tantamount to nuclear blackmail against a non-nuclear-weapon state" and breached U.S. obligations under the U.N. charter to refrain from the threat or use of force, Khazaee said.

"Such remarks by the U.S. officials display once again the reliance of the U.S. government on (a) militarized approach to various issues, to which the threats of use of nuclear weapons are not a solution at all," he added.

They also posed "a real threat to international peace and security and undermine the credibility" of the nuclear Non-Proliferation Treaty, the envoy said.

Obama is urging other global powers to agree to a fourth round of U.N. sanctions against Iran over its refusal to halt nuclear work that the West suspects is aimed at making bombs, a charge Iran denies.