31. In order to be compatible with the ECHR, any interference with Article 3 of Protocol no. 1 to the ECHR shall in the first place be prescribed by law, meaning that it should be sufficiently clear and foreseeable. The principle of foreseeability entails that an average person should be able to be aware and foresee, at all times and to a reasonable degree, consequences stemming from their actions to regulate their conduct accordingly.45 In principle, legislation should not have retroactive effect and exceptions to this rule should be clearly outlined in legislation, strictly limited to compelling public-interest reasons and only if in conformity with the principle of proportionality.46 For instance, it has generally been considered acceptable in the context of lustration “that people who held important posts in the ruling party and its repressive apparatus, or whose participation in repressive acts is proven, are subsequently banned from public service.”47 Moreover, prohibiting “the members of a local council, village or even small town elected from a party whose activities were prohibited after the beginning of the temporary occupation of Ukraine”, who may have been oblivious of the prohibited nature of the activities of their party or may have decided to leave their party after the beginning of the temporary occupation, from entering the civil service for positions of category “A” seems to be an unreasonable restriction.