(30)Member States should lay down rules concerning limitation periods necessary to combat the criminal offences related to the violation of Union restrictive measures effectively, without prejudice to national rules that do not set limitation periods for investigation, prosecution and enforcement. Member States are permitted under this Directive to establish limitation periods shorter than those laid down in this Directive, provided that in their legal systems it is possible to interrupt or suspend such shorter limitation periods in the event of acts which can be specified in accordance with national law.