Somehow, though, this idea was a very popular talking point, at least among the right-wing parrots commenting on the political blogs I read. Of course they aren't a good source for information, or true information, at least.
So I found this article on the topic fairly detailed, but perhaps a bit one-sided. Yes, it mentions that the US was trying to work with Russia on some major issues, like the Iran nuclear agreement, but doesn't probe whether a more robust response to Russian behavior would have scuttled those important initiatives. I have to wonder about the choices that were made, but I certainly can't conclude based on the available info that Obama was wrong.