The role of the state in the modern world is a complex one. According to legal theory, each state is sovereign and equal. In reality, with the phenomenal growth in communications and consciousness, and with the constant reminder of global rivalries, not even the most powerful of states can be entirely sovereign. Interdependence and the close-knit character of contemporary international commercial and political society ensures that virtually any action of a state could well have profound repercussions upon the system as a whole and the decisions under consideration by other states. This has led to an increasing interpenetration of international law and domestic law across a number of fields, such as human rights, environmental and international investment law, where at the least the same topic is subject to regulation at both the domestic and the international level (and indeed the regional level in the case of the European Union). With the rise and extension of international law, questions begin to arise paralleling the role played by the state within the international system and concerned with the relationship between the internal legal order of a particular country and the rules and principles governing the international community as a whole. Municipal law governs the domestic aspects of government and deals with issues between individuals, and between individuals and the administrative apparatus, while international law focuses primarily upon the relations between states.