Kolmogorov case: a Ukrainian border guard sentenced to 13 years in prison for doing his duty Since September 2014, the senior soldier of the Berdyansk Border Detachment, Sergiy Kolmogorov,has been under arrest by a ruling of the Primorsky District Court and the Court of Appeals of Donetsk Oblast (Mariupol). He has been sentenced to 13 years in prison. Heated discussions of this outrageous case continue on social and mass media. 255 0