Thank you.
First, the calculus would have what we call conditions-based elements to it. Putin would look at what the situation looked like. When Russian Federation military action is contemplated, they do a very thorough red teaming, as they call it. There are a lot of layers of assessment about what the probability and outcomes are going to be. It's multi-departmental. It's not just a military calculus, speaking to our point about sanctions that a previous questioner had raised.
The question is, was it foreseeable in some way? I think the answer is yes. I would wager that those who had the intelligence were well aware or were reasonably aware of the increased probability. Of course, you never know when they're massed on the border, because they've been massed on the border on many other occasions, during snap exercises and the like, which, arguably, is what they do these snap exercises for in the first place.
To the thrust of the question about whether it's possible that they would attack a NATO ally, it is hard to imagine, except in some sort of in extremis situation or miscalculation, that something like that would happen. If you just look at the Baltic countries, pretty much every ally has people there. If people were killed in that situation, everyone would respond. Everybody would, without a shadow of a doubt. That kind of situation only has one or two endings, and neither of them is really good for Mr. Putin, as an individual, or for the country, the Russian Federation, writ large.
Would Canada reply? Have we ever not replied? Yes, we would reply.