Subtract the nuclear option for now. This war revealed the true capability of the Russian military overall -- that it is at best a defensive capable military, not one capable of conquest.
By that, I mean the Russian military seems to be best capable of 'repelling boarders' type of warfare, which is how most of the world's militaries are. Cross borders means you are expeditionary, which is the US. A defense capable military can cross borders in the execution of its missions, but the deeper into foreign territory and longer it remains outside its territory, the weaker it become over time because of lack of materiel support which is an economic issue which leads us back to how Russia's economy have been in poor state for so long, which finally reinforce what is known all this time that economic power = military power.
