Knowing Vietnam like I do, the problem could well be more to do with kickbacks, under the guise of regulatory issues.
I.e if you don't line this persons pocket, there may be a (unlimited) 'delay' in getting approval. I'm sure Kim knows the Foreign and Corrupt Practices Act and would be very reluctant to line somebody's pockets illegally. Setting up a USA subsidiary could be a good move if only to 'call their bluff'. Often the strength of the corrupt comes from them believing that THEY are your only option. Illustrating that this is not the case can often be the catalyst to getting it approved. It's all about somebody big enough (VN government) pulling rank and pushing it through (without it definitely reduced kickbacks).