De acordo com a Ministério dos Negócios Estrangeiros :
From 9 September 2015 and on Ukraine's Border Guard Service officers shall be subtracting 180 days from the actual date a foreigner is entering/leaving Ukraine to see whether the 90-day limit has been exceeded.
For instance, if a foreigner enters Ukraine on 9 September Border Guard Service officers shall take away 180 days from that date and check whether the foreigner has overstayed the allowed number of days (90). The same procedure shall be carried out upon all departures.
O que significa que a regra 90/180 funciona exatamente da mesma forma que atualmente no espaço Schengen .