At this point? He can't. Ukraine won't stop before they've retaken all the land by force. He could have just taken Crimea and been happy with it and he would probably have gotten away with it, but everything after that has been one colossal fuck up after another, and there is no light at the end of this tunnel for him anymore.
Or well, maybe the muzzle flash created by the hot expanding gases accelerating the 6 grams of copper jacketed lead as it exits the barrel of 9x18mm Makarov that one of his KGB friends saved for sentimental reasons.