How should the West respond to Putin’s threats?

Vladimir Putin clearly wants us to worry that he is crazy enough to use a tactical nuclear weapon in Ukraine. This fear was intensified this week when images surfaced that some – possibly in error – believed showed a train operated by the secretive nuclear security forces moving towards Ukraine. Despite this, many believe the likelihood of a nuclear attack remains extremely low. Yet it is a plausible enough threat for the West to be considering how it should respond if Putin were to unleash one.

Russia has an estimated 1,900 non-strategic nuclear weapons (NSNWs), from artillery shells to warheads for missiles; their yields range from a mere 0.5 to 100 kilotons, more than twice the power of the bomb that devastated Nagasaki. However, Russia has not tried firing one in an exercise since 1990, and we do not even know how many are still usable, even after an inevitable overhaul.