And it is absurd to claim that Russia wants peace. It can literally have peace anytime it wants by simply pulling its troops out of Ukrainian territory and ceasing the launching of missiles and drones on the populace.
The US threats on Canada and Greenland are not made with "peace" in mind.
The best example of this is the Iraq war. The US invaded another country and sold it as a peace keeping mission because "They are building weapons of mass destruction!".
In fact, the US has decades of history doing such actions (see: banana republics and the CIA's anti-communism efforts).
I think the argument is all wars can be defensively spun. Russia apologists falling for the imminent-Ukraine-membership lie, MAGAs falling for the idea that we’re defending our Arctic interests by invading Greenland, Hitler’s argument that the Nazis were defending against a jealous Jewry and Europe, et cetera. The justifications for war are always, in part, however flimsily, couched in terms of defence (in modern times).