Could I add two quick points to that? One clearly is, you're absolutely right, the effectiveness of the UN measures depends on how, for example, China is interpreting “luxury goods” and whether they interpret that and then enforce it. That's all the more reason that we need to work multilaterally.
There are situations, for example, in Iran, in which we had a base level of sanctions, but it was not those sanctions that provided the pressure. It was the coordinated U.S., Canada, and in particular, EU sanctions on oil and the financial sanctions that were decisive, that really turned the screws to the point that it really hurt the Iranian economy.
They may be complicated. There may be some confusion at times between whose sanctions, but I think it was the combination of sanctions and it was like-minded states that decided to work together to use the UN sanctions as a base but go beyond it that was really decisive in the case of Iran.