OK you are "electing" her country of chargeability. This is called cross charging and has some "nuances" that may or may not be applied at the time of the interview. The 9FAM notes list some examples of cross charging. There is a lawyer (Bernie Wolfsdorf) who talks about cross charging to gain a benefit of better odds etc - but I have never found clarity in the rules that he says are possible.
As Susie mentioned above, IF the CO does the job right they should ask for education etc on both of you. Additionally they have to allow the elective cross charging. The rules say that this is normally not disqualifying if the applicant received no bnenefit (unlike a region change). However since Ukraine is limited it could be argued that you got a benefit in the draw.
9 FAM 42.33 N4.2 Chargeability (CT:VISA-1555; 09-30-2010) As stated in the regulatory definition, the normal rules of chargeability apply to INA 203(c) (8 U.S.C. 1153(c)) immigrants. Many applicants may seek beneficial treatment from the rules of cross chargeability, as in the following examples: (1) A spouse or child born in a country, which is not among those for which DV visas are available, may use the principal registrant’s chargeability when they are accompanying or following-to-join; (2) A child born in a non-qualifying country in which neither parent was born nor resident at the time of the child’s birth, may claim the birthplace of either parent; (3) A principal registrant born in a country, which is not among those for which DV visas are available, and the spouse who was born in a qualifying country, may be issued DV visas, provided the relationship was established prior to submitting the entry. In such instances, however, both applicants are considered principal applicants for the purpose of cross-chargeability and must be issued visas and apply for admission to the United States simultaneously.