What are the visa & residency requirements in Yemen?

"In order to visit Yemen, travelers must obtain a visa prior to arrival. The process of applying for a visa involves submitting an application form, a valid passport, two passport-sized photographs, and a fee. Depending on the type of visa, additional documents may be required. In order to obtain residency in Yemen, applicants must submit an application form, a valid passport, two passport-sized photographs, and a fee. Additionally, applicants must provide proof of employment, proof of financial stability, and a letter of recommendation from a Yemeni citizen. Once the application is approved, the applicant will be issued a residency permit," remarked another expat in Yemen.

What are the visa & residency requirements in Yemen?