I did not say anything about justification to invade. But if you want to say the US would not have a problem or fear if Mexico and Canada were to form a alliance with Russia or any other country without a Alliance to the US then I think you are kidding yourself.
In 2022, you think the US would resort to invading Canada or Mexico and taking over their government if they allied with Russia? Sleepy Joe Biden? Leading an invasion? Jokes aside, there’s no chance our intelligence would even let it get that far.
Unless maybe our intelligence gets severely compromised somehow.
I get the analogy but the dynamics between Russia and Ukraine aren’t even close to that of any of our neighbors. The point being that the US has a far different foreign policy dynamic that lead us to where we are and where we’ll go from here and that there really isn’t any scenario where a close neighbor would end up in that position so that’s what shapes how we handle foreign policy on the other side of the world.
I also think Russia under different leadership wouldn’t be in this position at all. Better leadership would’ve understood just how weak their military was in the first place.