US President Barack Obama visits Israel next week at the onset of spring - the "red line" previously drawn by his host, Prime Minister Benjamin Netanyahu, to trigger an attack on Iran's nuclear sites.
But an Israeli-Iranian war, Washington's nightmare as it tries to scale back defence commitments abroad and avoid a draining Gulf oil crisis, does not appear immediately imminent.
Officials and analysts say Iran has warded off the Israeli threat by calibrating its uranium enrichment so that it does not accrue enough fuel for a potential first bomb - the threshold Netanyahu warned about in a United Nations speech in September.
President Barack Obama set aside Middle East politics today to marvel at the beauty of the ancient archaeological city of Petra.
For all the warm words from the Barack Obama during his trip to Israel this week, an Israeli apology might have the most lasting impact.
President Obama appealed to young Israelis to pursue the path of peace with the Palestinians, during his visit to Israel.