India, June 21 -- The real test of the Islamabad Memorandum will not be the photographs, signatures, or press conferences. It will be what happens in the months that follow.

History has a peculiar habit of repeating itself, not as tragedy or farce, but as carefully choreographed diplomacy wrapped in grand declarations. The recently announced "Islamabad Memorandum" between the United States and Iran, brokered by Pakistan, is being hailed by some as a breakthrough in one of the most volatile geopolitical confrontations of the 21st century.

Yet beneath the celebratory headlines is a more fundamental question: can any agreement between Washington and Tehran survive if Israel believes it threatens its national security?

The answer, in all p...