I would not say exactly "karma". A known centre of propaganda and a gathering of people that, not being the army officially, but clearly part of the war effort in terms of spreading mis-information and pro-Z propaganda, and probably directly involved in cyberthreats... sounds to me like a perfectly valid war target.
I guess war is no longer than patriotic and marvellous when you know they can blow you ass in St Petersburg right under the podcaster chairs of the "keyboard patriots division". Alas, it will take many more people's lives in both sides to get to the peace that should have never been broken.
So you supported IRA bombing in UK?
Did the IRA only hit legitimate targets during a war? Did they not, for example, set bomb a city centre with no particular strategic value or target?
The fact that a concealed bomb is used does not make it a terror attack. RF is at war with Ukraine, espionage, propaganda and production centres are legitimate targets. It would be not be acceptable to bomb a supermarket, shell a Theatre or kill civilians, steal their property and mass-grave them.
I support the peaceful (read it again) right to self determination and, in general, a military defensive response against a military attack with the objective of reaching a durable peace. More so when a democracy or something that could become a true democracy is at war with a despot.