Well, the former (dem) Presidents had been unsuccessful to stop any war but create.
So, if this (strange) one will create peace and tear down the image of Russia being an all time enemy (formed by former administratoons) and respect their security/borders and invite to international conferences (G8) it will the better for the world.
Put yourself into Putin's shoes will help.
Also he sent a wake-up call to Europe to grow up and defend themselves, not only by waving the flag of democracy.