Syria's main Western-backed opposition coalition says it will take part in peace talks with the government if certain conditions are met, including allowing aid workers to access besieged areas.
The Syrian National Coalition announced its decision in a statement Monday after two days of talks in Istanbul.
U.S. Secretary of State John Kerry praised the announcement, saying the group's participation would be a "big step forward."
The group wants the government to guarantee the establishment of humanitarian corridors, the release of detainees and for the peace negotiations to result in a political transition in Syria.