Better set the fuck out of the precedent before Trump takes power. Russia's about to have the most powerful empire in history backing up their "that's a red line, no fair for you to do that" whines of outrage.
The only tiny solace I take in the whole impending disaster is that Trump is just as shitty a partner in geopolitics as he is in business or, I don't even want to say it, marriage. Russia may be planning on getting some mileage out of him that he's simply too dysfunctional as a person to deliver.