Are there any large countries in your world that don't have a military?

The СШР is the largest civilization in the galaxy by population, but they don't have a regular military. The NKRB (Homeland Security) has planetary defense forces but the Red Army is not part of the military or the government except under exceptional circumstances.

Under most circumstances, it's forbidden for followers of the Transformatsiya religion to serve in the military, because it's considered participation in violence on behalf of the state.

All of the gun stores are owned by the communist party because it's illegal for arms dealers to be capitalist businesses because it leads to capitalists profiting from violence. The economy of the СШР is market socialism.