The whole doctrine itself is built on the idea that you as an attacker don’t get to decide where the line is. The principle of ambiguity. Russia desperate wants to know where the line is, because they know very well that when they cross it it won’t end.

This is a fundamental principle of NATO as a defensive alliance, have always been and will continue to be.

Now you have voices, coming mostly from outside, that are trying to make this out to be a bad thing and to show some kind og weakness in the alliance, when it is one of the core tenants of the alliance itself.