If I could intervene for a second, I agree with Professor Cheung on his point. I would just like to add that I think the Magnitsky act would impose inconvenience on Hong Kong officials, but I have no doubt in my mind where their loyalty lies, where their political loyalty lies.
Having said that, I think sanctions also serve important signalling purposes. I think the importance of signalling should not be overlooked, but the actual impact could be rather limited, because short-term inconvenience could often be overcome by some creative measures.