The first rule is non-interference.
However, the alien races have a jurisdiction to work actively within the bounds of.
It is their mission to ally with our world, and this naturally includes helping us out with some things if we choose to let them.
If something directly and direly threatens our entire race or their entire objective with our race, it then becomes within their jurisdiction to intercede for us.
They could do this very discreetly and they can do it through the help of human individuals.
They do not need to make a scene or anything.