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WHEN the "Arab Spring" unexpectedly broke out late last year, Natan Sharansky waxed optimistic. Writing in the Washington Post in March, the former Soviet refusenik who ranks as Israel's best known pro-democracy activist argued that the grassroots revolts that unseated Tunisian strongman Zine el-Abedine Ben Ali and Egyptian dictator Hosni Mubarak marked the start of a democratic tsunami that could soon engulf the region. Regional conditions, he counseled, were ripe for just this sort of radical surgery.

These days, however, Israelis who share this hopeful outlook are exceedingly hard to find. A recent visit found policymakers and academics of all political stripes deeply apprehensive of the tectonic shifts that have taken place in their region this year. They have good reason to be. Israel's security environment, never favorable, has taken a dramatic turn for the worse.