Accountability for criminal homicide of Black people, especially by law enforcement, has definitely increased since BLM became a force. Whether that's a lasting effect is, of course, too soon to say, but it's not to be casually dismissed as you have.
Especially by law enforcement, or only by law enforcement? Criminal homicide of blacks is way up since BLM.
Without Russia propping him up Lukashenko would be out by now.
Think Solidarity, not BLM and get the whole country to grind to a halt. That will make a difference. By the time the police and the army have to decide if they want to open fire on their family it can be won. But for that to happen something major will have to change in Russia first.
Those instances are rare, but that's an existence proof that you can't deny (and there are, historically, more examples).
Note that the support for those Canadian protests amongst ordinary Canadians was minimal.
According to the Russian authorities, yes. According to me: those people are real heroes, right now it is far more dangerous to join such protests than when the numbers are higher, especially in places like Russia.
Of course, I'm not sure there are many parallels here to the situation in Russia/Ukraine.