UN Special Envoy Kofi Annan has called for a transitional government to be established in Syria.
The UN brokered peace plan, which calls for the creation of a transitional government in Syria, was accepted after talks in Geneva, attended by Russia, China and western countries.
The agreement says that members of the current government and the opposition could be a part of it.
"We are determined to work together urgently and intensively to bring about an end to the violence and human rights abuses, and the launch of a Syrian-led political process, leading to a transition that meets the legitimate aspirations of the Syrian people, and enables them independently and democratically to determine their own future," Mr Annan said.
"The action group has pledged action, and they are sending a message of determination and hope, but today's words must not become tomorrow's disappointments.
"The hard work starts now. We must work together to implement what has been agreed. We cannot do this alone. I hope all in Syria will embrace what has been laid out here and work with us to stop the killing and build a better future."
The initial plan by Mr Annan called for the removal of President Bashar al-Assad, but this was blocked by Russia.
However, US Secretary of State, Hillary Clinton told reporters after the talks on Saturday that Assad still has to go “given the blood on his hands”, stressing how it is “incumbent on Russia and China to show Assad the writing on the wall” and help speed up his departure.
The Syrian opposition immediately rejected any notion of being a part of a transitional government with Assad.
The Syrian government continues to reject external solutions to the crisis.
Mr Assad told Iranian television it was an "internal issue" and had "nothing to do with foreign countries".