NEW : Hamas warns Abbas not to go to the United Nations . As an observer , the delegation can speak in the General Assembly but not vote . Israeli Prime Minister Benjamin Netanyahu is expected to speak at the U.N. Security Council . Israel is calling on Palestinian leaders to return to peace talks , a spokesman says . Comment:
NEW : Hamas warns Abbas not to go to the United Nations . Israeli Prime Minister Benjamin Netanyahu is expected to speak at the U.N. Security Council . Israel is calling on Palestinian leaders to return to peace talks , a spokesman says . Comment: