I think Iran is threatening to use its nuclear arsenal on the wrong country.
Why wipe Israel off the face of the map when most European countries would rather take the path of out right surrender. If Iran ever attacks Israel it will celebrate its victory for the 15 minutes it takes for Israeli missiles to reach Iran and burn that country to the ground. France would never retaliate. Its surviving leaders would simply express its deep regret that France failed to debase itself properly and ask Iran for foregiveness.
The UK might strike back, but not until the idea was bandied back and forth in parliament for several weeks.
With no nuclear weapons Germany would simply start paying Iran reparations.