Here are some important changes to the K visa process, effective February 1st, 2010, when both the I-129F petition for a nonimmigrant K visa and the I-130 petition for an IR-1 (or CR-1) spouse of a U.S. citizen visa have been approved by USCIS and sent to the National Visa Center (NVC), the availability as well as the need for a nonimmigrant K-3 visa ends. If the NVC receives both petitions: The nonimmigrant K visa will be administratively closed.
If the NVC does not receive your I-130 petition and I-129F at the same time, the NVC will process your I-129F petition. Then NVC will send the petition to the embassy or consulate in the country where the marriage took place. If your marriage took place in the U.S., the NVC will send the petition to the embassy or consulate that issues visas in your country of nationality. If your marriage took place in a country that does not have an American embassy, or the embassy does not issue visas, the NVC will send your petition to the embassy or consulate that normally processes visas for citizens of that country. For example, if your marriage took place in Iran where the U.S. does not have an embassy your petition would be sent to Turkey.