Right now Russia's abilities are very limited.
Doesn't seem like a good story to backup this "lesson". What would happen if you showed a US Officer a (possibly missing) US Fighter jet in a hanger? Never trust a US Officer?
Reason number one would be that serving in military is viewed as good old "conscript obligation"[1]. Or as a way to get money (in some regions serving was the only way to get decent money. some people would actually give bribes to get a contract).
At the same time you learn nothing while in service (unless you are part of some elite force wich is a different story and they are few in number anyway).
A classic thing about russian military: out of a platoon only 2-3 guys are often throw grenades during their time. Only to show them off before some general. While others just mind their own business.
[1]: https://en.wikipedia.org/wiki/Conscription_in_the_Russian_Em...