British Foreign Secretary David Miliband and visiting US Secretary of State Hillary Clinton held a joint news conference in London on Sunday, with Clinton saying that the world "will not wait indefinitely" for Iran to live up to its obligations.

Britain's Foreign Secretary David Miliband (L) speaks during a meeting with US Secretary of State Hillary Clinton in London October 11, 2009. Clinton said on Sunday the international community would not wait indefinitely for Iran to show that it is prepared to meet its international obligations. Miliband, whom Clinton met in London, said Iran would never have a better opportunity to establish normal ties with the rest of the world.[Xinhua]

But the US diplomat hailed a recent meeting in Geneva between Iran and six world powers over nuclear talks, calling it "a constructive beginning".

The two also discussed Britain-US military strategy in Afghanistan and Pakistan.

Miliband said "transatlantic cooperation is very important as we face joint challenges" and Britain is determined to prevent return to Taliban rule in Afghanistan.

Both countries are considering whether to boost troops in Afghanistan. British Prime Minister Gordon Brown reportedly planned to send about 500 more troops to Helmand province to combat the Taliban.

The US diplomat said a militant attack on Pakistan's army headquarters is evidence of an increasing threat against the authority of the state.

But she said despite the attack, "We have confidence in the Pakistani government and military's control over its nuclear weapons."

Britain's Foreign Secretary David Miliband (L) greets US Secretary of State Hillary Clinton as she arrives at 1 Carlton Gardens in London October 11, 2009.[Xinhua]

Miliband also said "In respect of the nuclear issue, there is no evidence that has been shown publicly or privately of any threat to the Pakistani nuclear facilities."

Clinton's visit came at a time when bilateral ties got in sour due to US irritation over the release of the Lockerbie bomber.

Clinton said she is very grateful for the chance to reaffirm special relations with Britain and the US and Britain are partners working to build on shared values on all fronts.

The US secretary said British leadership is crucial in run-up to US President Barack Obama's call for world without nuclear weapons.

Clinton arrived in London on the second leg of a five-day tour of Europe and she will then have talks with Brown over the Northern Ireland peace process.

On Monday, Clinton will address the Northern Ireland assembly in Belfast, capital and largest city of Northern Ireland.