Click here to access article by Caleb Maupin from New Eastern Outlook (Russia).
I can't vouch for the credibility of this entire report (especially in relation to "Who are 'the Houthis'?" section.), but it has a ring of authenticity to it and provides a lot of new information I haven't seen anywhere else. Part of the problem I have with it is that there is no documentation. Thus, we have to rely on the credibility of the reporter. However, much of what he reports has been corroborated by other sources that I consider very credible.