Countries with nuclear weapons in Nato: Enough. I'd also go further and say that the world makes fairly extensive efforts to understand who has nuclear weapons

Countries with nuclear weapons in Nato: Enough. I'd also go further and say that the world makes fairly extensive efforts to understand who has nuclear weapons and how many, but that doesn't cover all WMD's. I have no idea what kind of strategic theater-level biological weapons exist in the world, but I imagine it's more than zero.