U.S. Is Weighing New Curbs on Iran in Nod to Israel - NYTimes.com
"With Israel openly debating whether to strike at Iran’s nuclear facilities in the coming months, the Obama administration is moving ahead with a range of steps short of war that it hopes will forestall an Israeli attack, while forcing the Iranians to take more seriously negotiations that are all but stalemated...

According to a tally by Graham Allison, the Harvard expert on nuclear conflict, the United States and its allies have allowed Iran to cross seven previous “red lines” over 18 years with few consequences."