Washington's top diplomat will try to deepen Israeli-Arab rapprochement at a summit in Israel on Sunday where he may also face pushback against the emerging Iran nuclear deal and questions about the US-Russia struggle over Ukraine.

Kicking off a regional tour, US Secretary of State Antony Blinken (above) will meet Israeli Prime Minister Naftali Bennett before joining Foreign Minister Yair Lapid and counterparts from four Arab countries at a desert retreat....