most serious crisis between Moscow and Jerusalem since Russia became militarily engaged in Syria three years ago, when a deconfliction mechanism was set up between the two countries to prevent any accidental mishaps in Syrian airspace.Foreign media sources have long reported that Israel possesses a nuclear weapons arsenal, which Israel has publicly denied.However, Prime Minister Benjamin Netanyahu used a visit to a secretive atomic reactor in late August to warn the country’s enemies that it has the means to destroy them, in what appeared to be a veiled reference to its assumed nuclear arsenal.Israel Atomic Energy Commission Director-General Ze'ev Snir also called for action concerning nuclear sites in the region at the 62nd General Conference of the International Atomic Energy Agency on Thursday."Iran and Syria pose significant proliferationthreats to the region, and the world," Snir said. "Syria built an undeclared, secretive military nuclear reactor at Deir al-Zour. Such concealment of illicit activities, is a clear violation of the NPT and Syria's safeguards obligations. The IAEA and the international community should have taken action 10 years ago, and must take action now."Snir also pleaded for strong actions against Iran, "The IAEA must conduct a robust verification of Iran's clandestine activities. The covert Iranian nuclear weapons program is a documented fact."Iranian officials have condemned Israel's "nuclear bombs" in the past.In August, Iranian Foreign Minister Mohammad Javad Zarif derided Israel for possessing "the only nuclear bombs in our region," along with the United States, calling "the former a habitual aggressor and the latter the sole user of nukes."Israel