By the international community of course. The same one that has heavily sanctioned Russia.
> And as another comment said, are you volunteering? You can even wage war against Russia now if you want to, volunteers in Ukraine are always welcome.
That's just a cheap deflection. Me dying in the trenches won't change anything; a coordinated properly aggressive response might teach the war criminals at the Kremlin that they will not be let off. It's just a repeat of Munich/Ethiopia, and no individual at our level can do anything about it but advocate for change in policy to our governments.