I don't know about other places, but at least in Czech Republic, approving Russian invasion it is not treason but it falls under generic law of "publicly endors

I don't know about other places, but at least in Czech Republic, approving Russian invasion it is not treason but it falls under generic law of "publicly endorsing crimes and atrocities" or whatever is it called. You could get prosecuted for approving terrorist acts, genocides, whatever else. Most of the time it ends in probation and fine, I think one famous case was with some asswipe celebrating the New Zealand mass shooting. There is also law against "promoting movements that aim to attack human rights and freedom" which is the law that lands you in prison if you promote Nazi ideology, wear Nazi symbols and similar. The Russian Z would fit there as well.