A prominent judge here has commented that the only reason the situation hasn't descended into a civil conflict yet is not so much that they aren't willing to fight as they simply not having what to fight with. Unlike in Ukraine, here there aren't any heavy weapons caches left over from the Soviet era, and again, unlike Donbass, the neighboring country isn't at all interested in arming and training a militia and deploying "little green men" until the locals can fend for themselves.
Really, this is just a repeat of 1934. Doubtful that things will escalate as they did back then, though -- civil disturbances and riots are one thing, a full-fledged armed insurrection is a whole another. There is still the practical matter of how to arrest the head of the Catalan government without anyone getting shot in the process, however.
Meanwhile in Russia...
Well, they were on losing side of Civil War IIRC