World and regional powers are meeting in Vienna to overcome stubborn divisions among Syrian factions that have led to the rise of Islamic extremists and claimed hundreds of thousands of lives since violence turned to war five years ago.

But the gathering is not expected to substantially advance efforts to find peace. A diplomat familiar with the talks says participants will agree on a document focusing on trying to firm up a shaky cease-fire and improving efforts to deliver humanitarian aid. He demanded anonymity because he is not authorized to discuss the statement before its release.

Tuesday's talks include U.S. Secretary of State John Kerry and his Russian counterpart, Sergei Lavrov, as well as foreign ministers or their deputies from more than 20 countries.