TEHRAN (AFP/Reuters) Irans supreme leader Ayatollah Ali Khamenei condemned on Sunday US President Barack Obama for issuing what he said was a threat of a nuclear attack against the Islamic republic. He (Obama) has implicitly threatened Iranians with nuclear weapons, Khamenei was quoted by state television as telling Irans top military officials in Tehran. These comments are very strange and the world should not ignore them because in the 21st century... the head of a state is threatening a nuclear attack, said the all-powerful Iranian leader. The US presidents statements are disgraceful. Such comments harm US and they mean that the US government is wicked and unreliable. On Tuesday, Washington unveiled its new nuclear policy which limits the nations use of nuclear arsenal but indicated the United States could make exceptions to outliers such as Iran and North Korea. Irans foreign ministry said that Tehran will lodge a complaint with the United Nations about what it sees as US Presidents threat to attack it with nuclear weapons. Foreign ministry spokesman Ramin Mehmanparast told the semi-official Fars news agency Iran would lodge a formal complaint to the United Nations, a move backed by a letter signed by 255 of Irans 290 members of parliament. Obama is pressing other global powers to agree to a fourth round of UN sanctions against Iran over its refusal to halt nuclear work that the West suspects is aimed at making bombs, a charge Iran denies.