The Soviet invasion of Finland led to them being expelled from the League of Nations which is something that should be considered for modern day organisations.
The civilian ownership of firearms is interesting but wouldn't provide significant national security in my opinion unless this is going to be extended to actual ownership of military grade weaponry which is impractical and unworkable.
Putin has also previously made mention of the justification of the Soviet invasion of Finland to reclaim territory so this should be warning to all previous Soviet states.
The League of Nations was in the process of collapsing when they did that though.
Also with a mass civil defence it’s very difficult to argue it’s a military threat (to a neighbour), but in terms of providing a deterrent to an invader it’s a very powerful one; you’d have hundreds of thousands / a million plus armed men who could really pose a danger to any invader).
As I’ve said before I think the security situation for Ukraine in the long term is going to be much better delivered by means other than NATO (so support from non-aligned nations and a mass militia). I mean, if Putin still invades it’s going to be much more impactful on the non-Western parts of the world and much more likely to produce a truly global response. No country would be able to trust him or his allies and he’d be a threat to the world.