First of all, I'm not opposed to sanctions. I think the problem with sanctions is that oftentimes they do not have the effect of shifting people's understanding that the world has changed without them. The effect of the last round of sanctions from 2014 up until the present crisis was to demonstrate to most people that sanctions are something they can live with.
At present, the new sanctions are far more far-reaching, but they could go further. Turning the oligarchs against one another is, ultimately, still weakening the regime, so I think they are worth pursuing. However, we need to go much further—by “we” I mean the west—in completely cutting off Russian energy.