Self defense yes, state military no.
How do you conquer a people that does not recognize unconditional surrender? How do you occupy a city if there is a gun behind every window? How do you break the morale of people who have tasted true anarchic prosperity? How do you maintain a logistics advantage over a society that isn't hobbled by poverty or capitalist 'tragedies of the commons' or the marketization of industries? Who could Russia threaten with nukes if stateless anarchist fighters from across the world storm the Kremlin?
If your country has a problem with desertion when fighting to prevent occupation by friggin Russia, maybe spend less time telling deserters they're shit and more time making a country worth fighting for.
The west has a massive economic lead on Russia. The one way the west can lose to Russia is by screwing up its population so badly that the west goes into an economic and/or geopolitical collapse, and western states are actually fucking doing it.
We have to defend ourselves against the likes of Russia, as well as against homegrown fascists and ultranationalists and state communists and any state that denies us human rights such as the right to housing, food, and queer liberation.
State militaries are crap at this. They'll be neutral or divide themselves according to state lines or join on the worse side or just desert because the state is crap. It's just that more effective military structures risk also recognizing the rich as an enemy.
We are endangering our capacity to defend ourselves, including from Russia, by handing the responsibility to defend us over to such an inefficient and hamstrung organisation.