According to today’s edition of Haaretz: 
Based on his evaluation that the United States isn’t going to do anything to frustrate the Iranian nuclear program, Defense Minister Moshe Ya’alon said Monday he’s changed his mind and now leans toward supporting unilateral Israeli action against Iran.
So whats going on?
In my opinion, we have to look at this statement from an Israeli domestic politics angle.
Yaalon is trying to score popularity points within Likud by attacking the Obama administration. Bibi can’t do this. He is the Prime Minister. It would be too costly for him. But Yaalon can and he knows this endears him to the hardliners in Likud.
In fact Yaalon already attacked Kerry before regarding the peace process. So much so that the Americans demanded that Netanyahu condemns his statement. Now he is attacking the Obama administration regarding Iran.
This is much more about domestic politics. Yaalon’s statements today do not signify a major change in Israel’s Iran strategy.
If he can , be certain we will castrate him and time will tell.