Who carries out investigation for election-related criminal offenses?

Criminal Procedure Code of Ukraine (1. Date not specified, butchecked the authentically Ukrainian version, and it seems up to date as of2013)

Sources: http://www.en.pravo.org.ua/files/Criminal%20justice/CPC.pdf

http://legislationline.org/documents/action/popup/id/16257/preview

Article41. 1. Operational units of the bodies of internal affairs, securityagencies, agencies supervising compliance with the tax legislation, and thoseof the State Penitentiary Service of Ukraine, State Border Guard Service ofUkraine and State Customs service of Ukraine shall conduct investigative(search) actions and covert investigative (search) actions in criminalproceedings upon written assignment of the investigator, public prosecutor.

Article216. 1. Investigators of bodies of internal affairs shall conduct pre-trialinvestigation of criminal offenses as established in Ukraine’s law on criminalliability, except those which are in competence of other pre-trialinvestigation agencies.