CAIRO -- Arab leaders say new Middle East tension could arise if Israel's new right-wing prime minister rejects the land-for-peace framework agreed to five years ago. The leaders of 21 Arab nations wound up their two-day summit Sunday by issuing a statement saying they would reconsider their relations with Israel if Israel rejects the land-for-peace formula accepted by both sides as the basis for a settlement. ""Any deviation by Israel on implementing its obligations and agreements will create a response,"" said Egyptian Foreign Minister Amr Moussa, the summit spokesman. ""This would lead us to a setback in the peace process, and, naturally, the Arab world will reconsider all the steps they have already taken."" The statement did not specify what actions the Arabs might take, and Moussa refused to elaborate. But the most punishing strategy -- something discussed at length in closed sessions of the summit -- would be to cut off emerging economic ties between Israel and the Arab world.