Washington: US Secretary of State Hillary Clinton has warned Iran on Wednesday that the time for diplomacy is not infinite and all options are on the table to stop it from acquiring a nuclear weapon.

"There is still time and space to pursue the objectives that we seek through diplomacy. We want to see a peaceful resolution of the international community's concerns," Clinton told reporters.

"But the time for diplomacy is not infinite, and all options remain on the table to prevent Iran from acquiring a nuclear weapon," she said.

"We are not interested in talks for the sake of talks. We want to engage in serious discussions that will lead to concrete results," she added.

Clinton was responding to questions on latest round of discussions being held between Iran and officials of European Union on the next round of talks between Iran and P5- Plus-1 countries -- Britain, China, France, Russia and the US, which are the five permanent members of the Security Council, plus Germany.

"I want again to urge the Iranian Government to take this opportunity to begin addressing the international community's concerns about the possible military dimensions of the Iranian nuclear programme," Clinton said.

"Until Iran comes into compliance with its international obligations and demonstrates the peaceful intent of its nuclear program, they will continue to face strong pressure and isolation," Clinton said.

"So the sooner that we can begin talks, the better it will be," she said.