David Cameron has said he wants to see peaceful transition of power in Syria, rather than revolution, ahead of talks with US President Barack Obama.

会见美国总统奥巴马前，大卫·卡梅伦称，他希望看到叙利亚政权的和平过渡而非改革。

The UK prime minister said he was frustrated¹ at the "appalling²（可怕的） " situation in Homs, which has been under assault by government forces.

Mr Cameron also said the public wanted "an endgame（尾声） " to the war in Afghanistan.

The leaders are expected to agree that Afghan forces should take over a lead combat role early - by mid-2013.

However, Mr Obama has said there will be no "rush for the exits". British and US combat troops are expected to leave Afghanistan by the end of 2014.

Basketball game

The first day of Mr Cameron's three-day visit saw the leaders emphasise³ the importance of the "special relationship" between the two nations.

And Mr Obama made Mr Cameron the first foreign leader he has welcomed onto the presidential plane Air Force One, as they travelled to Ohio to watch a university basketball game.

The president and prime minister were in the front row at the US college basketball championships

Shared foreign policy concerns, such as the situations in Iran and Syria, are also expected to be high on Wednesday's agenda.

The leaders will discuss diplomatic and economic measures to increase pressure on the Syrian regime of President Bashar al-Assad.

And Mr Cameron told reporters in Washington: "We're all frustrated by Syria. What's happening in Homs is completely appalling."

The United Nations has suggested more than 8,000 people have died since anti-government protests erupted a year ago, with many casualties in Homs where government forces have been trying to root out rebel fighters.

"I'm endlessly kicking the tyres and asking what else can be done," said Mr Cameron.

"The shortest way of ending the violence is a transition where Assad goes, rather than a revolution from the bottom. Transition at the top rather than revolution at the bottom."