CON uses victory points to shortlist the best players and declare them winners.These VP are allocated on the basis of land held by player and doesnt take into account how the land was conquered.
Supposed france,spain,korea and russia joins the game,russia left immediately and korea conquer his land without any difficulty while frace and spain engage in a deadly war which france was able to win after many days with different tactics but korea will have more VP without any fight.In a coalition too sometimes a player do all the hardwork in killing enemy by airforce and other players just take the land and he doesnt get any reward.
My suggestion is that apart from land acquired some vp should be awarded proportional to cost of the unit killed for example if 2 vp for killing an infantory then 4 vp for destroying a tanks.You can also impose a small penalty for losing a troops for example 4 vp for killing a tanks then 1 vp for losing a tank.