Israel has released valuable intelligence on Hezbollah weapons placement. Will the U.N. and Arab governments act?

Four years ago last week, Hezbollah launched a cross-border attack from Lebanon into Israel. Eight Israeli soldiers were killed and two reservists kidnapped. (They died sometime later, and their remains were subsequently returned to Israel in a prisoner exchange). This attack ignited a month-long war. Israel responded with an air, sea and ground campaign, while Hezbollah launched some 4,000 rockets and missiles into the Jewish state. Nearly 1,200 people in Lebanon and 160 in Israel died.

The summer 2006 war ended with United Nations resolution 1701, which imposed a blockade on weapons intended for Hezbollah and banned it from operating near the Israeli border. To implement its provisions, the resolution dispatched a U.N. peacekeeping force to Southern Lebanon which, as of April, numbers over 11,000 troops from 31 nations.

Israel recently embarked on an extraordinary form of deterrence against the possibility of a second Hezbollah war. Instead of engaging in a pre-emptive military strike, the Israeli military launched a public relations offensive. It broadcast and publicized highly detailed intelligence maps and aerial photographs depicting exactly where Hezbollah constructs and maintains missile and rocket caches, as well as command centers.

These maps show that Hezbollah's bases are located in villages in southern Lebanon near the Israeli border, in very close proximity to schools and hospitals. Its weapons are aimed at Israeli cities and civilian targets. If these missiles were to be launched, Israel would be required to defend its population by destroying the missile emplacements and depots.

"Hezbollah has worked to develop its readiness to rise to the challenge should it arise, and we can safely say that in the past four years we have prepared ourselves far more than Israel has," the group's second in command, Sheikh Naim Qassem, said in an interview published last week in the Arabic-language daily An-Nahar.

The Hezbollah plan of deployment means that any Israeli military response to a massive missile attack on its civilian population will involve civilian casualties in Lebanon. Because of its deliberate placement of these weapons, Hezbollah is condemning Shiite villages to destruction.

The U.N. now faces the test of whether it will do anything to assure the legitimacy of its 2006 resolution. If the U.N. does not act against Hezbollah's weapons caches, the resolution will be revealed as merely a stick with which to beat Israel and not the means to enforce the cease-fire the U.N. insisted Israel comply with to end the war.

Arab governments also face a critical test. By making its deterrence transparent, Israel is offering the governments of Syria, Lebanon and their Arab supporters, as well as world policy makers, an opportunity to protect Arab lives instead of blaming Israel after the fact for what can be prevented.

Now that Israel has taken the rare step of disclosing its valuable intelligence, will the U.N. enforce its own resolution to prevent war? Will the Arab governments in the region act?

Mr. Cohen is the author of "Beyond America's Grasp: A Century of Failed Diplomacy in the Middle East" (Farrar, Straus & Giroux, 2009) and president of the Institute for Middle East Peace and Development.

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