Earlier quoted context omitted.
>'if this isn't for you then you can go home' I did compulsory military service, including in a leadership role. "If you don't do what you're told, you don't get go home next weekend." Worked very well for conscripts, who usually get to go home for many weekends (unless on exercises). There are also many smaller privileges you can take a way for smaller infractions. Although when you have a defensive military that do…
A credible deterrent in 2020 is not 200k dudes with guns. It's air and naval power. Expensive and complex hi tech death machines. Of course, a 10m country will never have a really credible defense against nuclear super power Russia by itself.
If you're worried about NATO or former Warsaw Pact aggressors, no, men with rifles are not a deterrent.
If you're worried about a neighboring region's warlords sending people to steal your food, kill the men, rape the women and conscript the children, yes, men with rifles can convince them that their activities will be more fruitful somewhere else.
For a threat like Russia or the USA, your only recourse is to ally with one or the other.