What is important in this case is not so much the security of the single shipment but rather the security of the system in which both producers and consumers have a stake. In these cases, it can be argued that countries should strive for a certain degree of energy self-sufficiency, in addition to establishing the conditions for the market to resume its role. More recently, the interruptions in Russian gas supplies that repeatedly struck Europe since 2006 encouraged an orientation towards alternative suppliers, a different vector of delivery (substituting pipeline gas by LNG) and domestic resources such as renewable energy.