President Barack Obama told world leaders on Thursday that they must step forward to support the peace talks between Israel and the Palestinians or risk more years of conflict and bloodshed.

In an address to the United Nations General Assembly in New York, Obama renewed the U.S. commitment to Israel’s security and urged Arab nations to match their pledges of support for the peace process with deeds that will push it forward.

“Those who long to see an independent Palestine rise must stop trying to tear Israel down,” Obama said. “After 60 years in the community of nations, Israel’s existence must not be a subject for debate.”

Obama said those who count themselves as friends of the Palestinians in the Arab world must seize the opportunity for a peace agreement that will lead to a Palestinian state. They can do that by supporting the Palestinian Authority financially and politically and by coming to terms with Israel’s existence, he said.

The U.S.-sponsored peace talks are near a critical juncture with the scheduled Sept. 26 expiration of Israel’s 10-month moratorium on settlement construction. Obama reiterated his call for Israel to extend the moratorium as a way to build trust and keep the process going.