I would say the fact that you have Russia in an active and open war on European territory in the context of NATO being in existence is unprecedented.
Russia probing allied defences and responses, I would say, is not unprecedented. We saw that throughout the Cold War, not only in Europe but also vis-à-vis North America, where the issue of having to scramble jets to escort Russians out of NATO or North American airspace was a reality. I don't think it's unprecedented in that context, but I notice that Mr. Curran has something to add.