President Obama said yesterday that he doesn't think Israel has decided whether to attack Iran, telling NBC News in an interview that the United States was "going to be sure that we work in lockstep as we proceed to try to solve this - hopefully diplomatically."
Despite harsh economic sanctions and international pressure, Iran is refusing to abandon its nuclear program, which it insists is purely civilian.
Is Israel bluffing? Israeli leaders have been claiming Iran is pursuing nuclear weapons since the early 1990s, and defense officials have issued a series of ever-changing estimates on how close Iran is to the bomb. But the saber-rattling has become much more direct and vocal.
Prime Minister Benjamin Netanyahu frequently draws parallels between modern-day Iran and Nazi Germany on the eve of the Holocaust.
Israel views Iran as a mortal threat, citing Iranian calls for Israel's destruction, Iran's support for anti-Israel militant groups and Iranian missile technology capable of hitting Israel.
On Friday, Iran's supreme leader, Ayatollah Ali Khamenei, called Israel a "cancerous tumor that should be cut and will be cut," and boasted of supporting any group that will challenge the Jewish state.
When faced with such threats, Israeli has a history of lashing out in the face of world opposition.