From the US State Department:
“The U.S. Mission to Ukraine is not currently offering visa services. Beginning immediately, Ukrainian immigrant visas (IVs) other than adoption cases will be processed at Consulate General Frankfurt, including Diversity Visa (DV) and Fianc(é)e (K-1) visas. The U.S. Embassy in Warsaw will process Ukrainian adoption cases as well as A and G diplomatic and official visas. Contact KyivIV@state.gov for questions about Ukrainian immigrant and fianc(é)e visa cases. Nonimmigrant visa (NIV) applications may be processed wherever a Ukrainian applicant is physically located and can schedule an appointment. Interested applicants should follow instructions on the respective Embassy website to apply for an NIV. Please find a list of Embassy websites here: https://www.usembassy.gov.
Ukrainian applicants do not require a Schengen visa to enter Germany or Poland. However, IV and DV applicants who already have been scheduled for appointments in Frankfurt or Warsaw may request their cases be transferred to another post. To do so, the applicant should contact the alternate post to request a case transfer, and the transfer is contingent upon the alternate post’s acceptance of the case. IV and DV applicants who have not yet been scheduled will be automatically reassigned to Frankfurt and will be notified once their appointment is on the calendar. Unscheduled Ukrainian DV applicants who need to interview outside of Germany can send requests to KCCDV@state.gov.
Visit travel.state.gov for the latest information on consular services, including visa processing."