Historians generally agree on the broad outlines of the Israeli bomb. The program began in the late 1950s with substantial French assistance, was housed at the Negev Nuclear Research Center near Dimona, and is widely estimated to have produced Israel’s first nuclear weapons by the late 1960s, with an arsenal that now stands at roughly 100 to 200 warheads. The official Israeli formulation — that the country “will not be the first to introduce nuclear weapons to the Middle East” — has preserved deliberate ambiguity for more than sixty years, and that ambiguity, not any single technical decision, is the most distinctive feature of the case.
Israel’s policy of ambiguity is the central fact of the case. See nuclear proliferation beyond the superpowers for the broader context.
Israel’s strategic situation in the 1950s was unforgiving. The 1948 war, the 1956 Suez war, the 1967 Six-Day War, and the 1973 Yom Kippur War demonstrated that conventional military advantage could shift quickly and that Arab states, sometimes backed by Soviet supplies, could mount large coordinated attacks. The Holocaust was a permanent feature of the Israeli strategic imagination. The lesson that a small state in a hostile region drew, as a matter of national consensus, was that survival required an ultimate guarantee that conventional arms could not provide.
The Israeli program was launched in the late 1950s with substantial French assistance. The Negev Nuclear Research Center near Dimona was constructed in 1957–1958 as a “research reactor” project. The reactor was a 24-megawatt heavy-water-moderated natural-uranium design, suitable for plutonium production. The Mordechai Vanunu disclosures of 1986, based on his employment at Dimona in 1976, produced the first detailed public account of a substantial Israeli thermonuclear capability.
The official Israeli formulation, attributed to the defense establishment in the 1960s and maintained since, is that Israel “will not be the first to introduce nuclear weapons to the Middle East” — a formula that does not say whether Israel possesses them. The policy of ambiguity allows Israel to avoid the international sanctions and diplomatic isolation that a public acknowledgment would trigger, to avoid the formal obligations of the NPT, and to retain the deterrent effect of suspected capability. The arrangement has held for sixty years.