The U.S. Department of State designated U.S. Embassy Djibouti to handle American Citizens Services cases emanating from Yemen & process visas for Yemeni citizens. If you are in Yemen & have questions re: your federal benefits email FBU.Jerusalem@SSA.gov.
The fiancé(e) K-1 nonimmigrant visa is for the foreign-citizen fiancé(e) of a U.S. citizen. The K-1 visa permits the foreign-citizen fiancé(e) to travel to the United States and marry his or her U.S. citizen sponsor within 90 days of arrival. You can learn more here fiancé(e) visas.