It is meeting today at the UN headquarters in New York. Over 150 world leaders are attending. A new record and a security nightmare.
The United Nations General Assembly is one of the six principal organs of the United Nations and the only one in which all member nations have equal representation. Its powers are to oversee the budget of the United Nations, appoint the non-permanent members to the Security Council, receive reports from other parts of the United Nations and make recommendations in the form of General Assembly Resolutions. It has also established a wide number of subsidiary organs.
Today both President Obama and President Putina addressed the Assembly and both spoke of Syria. They have different agendas but finally it looks like everyone will concede the general slaughter should stop, Assad might have to hang around for a little while before being retired, ISIS must be dealt with and if all the institutions of Syria are destroyed the vacuum will not be filled with nice happy people. A further tricky bit will be agreeing on which oil pipeline goes where. The US, Europe, Russia and others all have differing ideas.
The UN Assembly summary - At present an expensive and only very occasionally useful talking shop. The best option given the lack of any other.