Palestinian President Mahmoud Abbas urged Israel to accept a two-state solution based on 1967 borders, warning that the opportunity would not stay on the table for long. Abbas set out the Palestinian case for statehood and full UN membership at a World Economic Forum conference in Istanbul, stressing that membership of the United Nations should not prejudice negotiations with Israel. Turkish Prime Minister Erdogan told the conference the Palestinian issue remained the most important problem threatening peace and stability in the region and that there was mounting anger with Israel over its policies.