Even though your I-600A approval is valid for 18 months, the FBI clearance is valid for only 15 months and must be resubmitted for clearance after that period. Please make sure before traveling to Ukraine to adopt that your fingerprint results are still valid and will not expire before you come to file an I-600 petition and apply for a visa at our office. If your fingerprints are about to expire, please submit a new set to USCIS for clearance before leaving the U.S. If your fingerprints are not valid when you come to apply for the immigrant visa for your adopted child in Kyiv, we will have to take them here and send them through the State Department to the FBI for check. This process cannot be expedited and currently takes from seven to ten business days or longer.