Belgian prime minister and various major Belgian political figures (some being separatist, some not) have already condemned the use of violence. See https://twitter.com/CharlesMichel/status/914455311553040384

Edit: to be fair, the twitter accounts of Macron, Merkel, lepen and others are silent.

Russia does murder separatists in Chechnya and Dagestan literally every day. Clearly you aren't aware of that because nobody loudly condemns it.

I didn't think of that, but that's a very valid point reg. Russia.

If this was happening in Russia, nobody would say nothing because there is nothing to say.

German police in the last G20 (Hamburg) was more violent, for example.