Syria's governement says a presidential election will take place on June 3, but Western leaders say the vote is a "parody of democracy".
Turkish Prime Minister Recep Tayyip Erdogan says his armed forces shot down a Syrian military plane after it crosed into Turkish air space.
Syria's exiled opposition will be barred from a presidential election to be held before July, virtually ensuring Bashar al-Assad's re-election.
The international mediator for Syria has apologised for a lack of progress at "laborious" talks in Geneva.
Mediator Lakhdar Brahimi will meet representatives of the warring sides in Syria separately for the first few days to increase pressure on them.
Syria expects to remove 200 people from the city of Homs during a three-day ceasefire while humanitarian organisations provide aid to those remaining.
Russia has offered assurances that the Syrian government will soon ship more toxic agents abroad for destruction.
Rebels with ties to al-Qaeda have posted an internet video of a beheading of a pro-government fighter in Homs.
Aid agencies in Syria have evacuated hundreds of people from the rebel-held Damascus suburb of Yarmouk.
The first round of peace talks has ended with no progess made on ending the civil war or commitment from the govt to return to the negotiating table.
Human Rights Watch says the government has levelled thousands of buildings under the guise of urban planning to punish residents of rebel-held areas.
A Human Rights Watch report has evidence that Syrian authorities unlawfully demolished residential buildings in Damascus and Hama in 2012 and 2013.
The US has demanded that Syria allow aid in to Homs, as peace talks over the future of President Bashar al-Assad continue.
Syria: The long road to finding peace after years of war.
A shocking report about the systematic killing of detainees Syrian jails is just the tip of the iceberg, experts say.
UN aid agencies say heavy fighting has prevented health workers from getting polio vaccine to 100 000 Syrian children.
The OPCW has called on President Bashar al-Assad to pick up momentum in handing over Syria's remaining chemicals for destruction.
Reported cases of Christians killed for their faith spiked last year, with Syria accounting for more than total worldwide deaths in 2012.
Syria has started moving chemical weapons materials out of the country as part of the disarmament programme, which has faced technical problems.