The problem I have long had with people who propose that we should wage economic warfare against countries that we are not altogether happy with, is that it is a form of warfare. I know, you'd never guess that from the title but there it is. It really shouldn't be a surprise when Russia retaliates in kind. The thing about war that escapes politicians is that once you embark on a course of war, it escapes. It consumes and grows and gets out of control. One really shouldn't allow an idiot to talk about imposing economic sanctions on a foreign country unless that idiot is referring to some banana republic.
Russia is not any kind of banana republic. John Kerry Won't You Please Come Home.*
*They made a movie with a title just like this, but different.