“This [may] mean imprisonment for up to five years. So, once again I strongly advise residents of the temporarily occupied territories: do not take a [Russian] passport, do not go to referendums, do not cooperate with the occupiers and leave, if it’s possible,” the official stated.

https://www.zerohedge.com/geopolitical/ukraine-threatens-5-year-prison-sentence-anyone-voting-sham-referendums