The way I look at it, that is truly the nuclear option. When that was used against Iran, it basically pushed Iran back to the Stone Age from an economic perspective. The question we have to ask ourselves is whether we should use such a blunt instrument as a first choice or whether it should be the last possible choice, because it affects everybody in Russia, many of whom are just as much victims of Vladimir Putin as Ukraine is and as we are.
Furthermore, there are all sorts of economic repercussions that will happen in the west. If we don't allow Russia to use the bank payment system, how does Germany pay for its gas?
If we have another tool that avoids all this collateral damage—it goes straight to the heart of the decision-making system; it avoids hitting Russians and it avoids hitting ourselves—that should be used, and it should be used aggressively first.