Principles in terms of Obligations EU MS
* created enforcement criteria when founding treaties lacked specific provisions
* Facts: Greece imported maize from Yugoslavia, presented as Greek maize so no levies, when found that Greece did not fulfil its obligations to the Union asked it starts proceedings against actors involved, Greece did not do this so case went to CJEU
* Art 4(3) TEU = principle of sincere cooperation
* MS should impose penalties on individuals who failed to fulfil community obligations
* MS have discretion in determining appropriate measures to be taken, but should be based on 1) princ of effectiveness and 2) princ of assimilation (Art 325(2) TFEU)
* Criteria for penalties
* 1) effective 2) proportionate 3) dissuasive
* essentially, analogous to those if similar to a national infringement