Iran not serious in having a dialogue:
The US has said that Iran is not serious in having dialogue with the international community on nuclear issue, a day after Iranian President Mahmoud Ahmadinejad said he was willing to have a face-to-face meeting with US President Barack Obama on this issue.
President Barack Obama said today he is offering Iran ``a serious, meaningful dialogue'' over its disputed nuclear program, while warning Tehran of grave consequences from a united global front.