I think this is perhaps a little misguided. They extend these "special invitations" all the time, usually as a way to include nations that want to participate but don't have qualified athletes. Here in Cambodia they not only give out special invitations to the men and women, they also contribute financially to getting them there. Also while there may have been pressure, I don't think we can say that an Olympic committee "forced" one of the biggest military powers on earth to participate in a sporting event. There may have been inappropriate pressure applied, but they did ultimately still have a choice.