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====Negotiations for a Test Ban began in 1958====
[[File:Op_hurricane.jpg|thumbnail|300px|left|Great Britain's first atomic weapons test in 1952 at the Monte Bello Islands, Western Australia .]]
The three countries entered into negotiations for a comprehensive test ban treaty in 1958. Having recently completed rounds of tests, at that time all three entered into a voluntary moratorium on all forms of testing, initiated first by the Soviet Union but later adhered to by the United States and Great Britain. In spite of this willingness to self-restrict testing, one of the most difficult issues preventing the conclusion of a formal treaty was the question of verification. The United States and Great Britain, in particular, pushed for on-site inspections of Soviet facilities as, without them, it was impossible to determine whether the Soviets were continuing underground nuclear tests or just experiencing the frequent seismic activity to which its geographic area was prone.
However, the Soviets were hesitant to permit such onsite inspections of its nuclear facilities, interpreting U.S. insistence on these inspections as a ruse to facilitate U.S. efforts to spy on Soviet advancements. After the Soviet military shot down an American U-2 spy plane over Russia in 1960, the prospects for reaching an agreement on the inspections issue all but disappeared. Khrushchev also rejected the idea of having the United Nations conduct inspections after observing what he believed was the organization’s mishandling of the Congo crisis. Instead, in the wake of these incidents both the United States and the Soviet Union resumed testing.