in the interest of equity. Turkey has itself applied the customary 12-mile limit to its coasts outside the Aegean. Tensions over the 12-mile question ran highest between the two countries in the early 1990s, when the Law of the Sea was going to come into force. On 8 June 1995, the Turkish parliament officially declared that unilateral action by Greece would constitute a casus belli, i.e. reason to go to war. This declaration has been condemned by Greece as a violation of the Charter of the United Nations, which forbids "the threat or use of force against the territorial integrity or political independence of any state". National airspace National airspace is normally defined as the airspace covering a state's land territory and its adjacent territorial waters. National airspace gives the sovereign state a large degree of control over foreign air traffic. While civil aviation is normally allowed passage under international treaties, foreign military and other state aircraft (unlike military vessels in the territorial waters) do not have a right to free passage through another state's national airspace. The delimitation of national airspace claimed by Greece is unique, as it does not coincide with the boundary of the territorial waters. Greece claims of airspace, as opposed to currently 6 miles of territorial waters. Since 1974, Turkey has refused to acknowledge the validity of the outer 4-mile belt of airspace that extends beyond the Greek territorial waters. Turkey cites the statutes of the International Civil Aviation Organization (ICAO) of 1948, as containing a binding definition that both zones must coincide. Against this, Greece argues that: its claim predates the ICAO statute, having been fixed in 1931, and that it was acknowledged by all its neighbours, including Turkey, before and after 1948, hence constituting an established right; its 10-mile claim can also be interpreted as just a partial, selective use of the much wider rights guaranteed by the Law of the Sea, namely the right to a 12-mile zone both in the air and on the water; Greek territorial waters are set at the 6-mile boundary only because of Turkey's casus belli. The conflict over military flight activities has led to a practice of continuous tactical military provocations, with Turkish aircraft flying in the outer 4-mile zone of contentious airspace and Greek aircraft intercepting them. These encounters often lead to so-called "dog-fights", dangerous flight manoeuvres that have repeatedly ended in casualties on both