It is undeniable that Ukrainian treatment is very fair. Look would US be giving out us citizenship to Iraqis or afghanis - there would be no Taliban. But Instead I believe it was all stick.

Ukrainians get citizenship and are not limited in any way - they can just leave Russia if they don’t like it. It is true - their movement is not limited nor do they stopped at the border.

Canada/UK situation - I recommend checking this out: https://youtu.be/8QpXlzlFKPU.

But in short UK was very much a US geopolitical rival up until WW2. Britain lost its geopolitical status as a result of the WW2 and was heavily indebted and had no choice but to dismantle the empire. So Canada and so is Mexico - up to this point they are not in the position to threaten us. They are carefully watched as well, not allowed to build up the military, not I think they are in that position.

Would Canada try to join a hostile military alliance ( like Ukraine with NATO), I guarantee you - US would flatten it.