Most realistic targets for a possible Israeli nuclear strike are significantly closer than other nations envisaged making strikes and would likely only require a small number of warheads to ensure success, compared to hundreds or thousands needed by a first strike attack against the USSR or NATO.
Most realistic targets for a possible Israeli nuclear strike are significantly closer than those spread across the former USSR or US and Canada and there is no known doctrine for long duration Israeli airborne nuclear patrols. Envisaged strikes and would likely only require a small number of warheads to ensure success, compared to hundreds or thousands needed by a first strike attack against the USSR or NATO.