Western companies need state help Imagine you are GCHQ or the NSA. You discover a 0-day. Do you a) make sure your own citizens and allies are patched ASAP or b

Western companies need state help Imagine you are GCHQ or the NSA. You discover a 0-day. Do you a) make sure your own citizens and allies are patched ASAP or b) keep it quiet so you can use it yourself, perhaps on said citizens?