A no-fly zone, also known as a no-flight zone (NFZ), or air exclusion zone (AEZ), is a territory or area established by a military power over which certain aircraft are not permitted to fly. Such zones are usually set up in an enemy power's territory during a conflict for humanitarian or military reasons without consent of the enemy state, similar in concept to an aerial demilitarized zone, and usually intend to prohibit the enemy's military aircraft from operating in the region. Military action may be employed by the enforcing state and, depending on the terms of the NFZ, may include preemptive attacks to prevent potential violations, reactive force targeted at violating aircraft, or surveillance with no use of force. Air exclusion zones and anti-aircraft defences are sometimes set up in a civilian context, for example to protect sensitive locations, or events such as the 2012 London Olympic Games, against terrorist air attack. A no-fly zone is generally not considered a form of aerial blockade due to its more limited scope compared to an aerial blockade. No-fly zones are a modern phenomenon established in the 1990s. They can be distinguished from traditional air power missions by their coercive appropriation of another nation's airspace only, to achieve aims on the ground within the target nation. While the Royal Air Force (RAF) conducted prototypical air control operations over various contentious colonies between the two World Wars, no-fly zones did not assume their modern form until the end of the Gulf War in 1991. During the Cold War, the risk of local conflict escalating into nuclear showdown made military intervention as a tool of United States statecraft unappealing. Furthermore, air power was a relatively blunt instrument until the operational maturation of stealth and precision-strike technologies. Before the Gulf War of 1991, it had not been possible to perform nuanced attacks against transitory, difficult-to-reach targets, and air power thus lacked the ability to produce decisive political effects short of total war. However, the demise of the Soviet Union and technological advances in aerospace capabilities made no-fly zones viable in both political and military contexts. Enforcement of a no-fly zone is subject to the rules of armed conflict under international humanitarian law.
Past no-fly zones
Iraq, 1991–2003
Following the 1991 Gulf War, the United States along with other Coalition nations established two no-fly zones in Iraq. US and Coalition officials stated that the northern no-fly zone was intended to prevent attacks against the Kurdish people by the Iraqi regime of Saddam Hussein, and that the southern no-fly-zone was intended to protect Iraq's Shia population. On 16 March 1988, the Iraqi Air Force deployed chemical weapons against Kurdish civilians during the Halabja chemical attack, killing roughly 5,000. This air-to-ground event served as part of the motivation used by Coalition Forces in order to extend and expand the NFZs, as well as citing parts of Article 42 within the U.N. Charter. The southern no-fly zone originally extended to the 32nd parallel, but was extended to the 33rd parallel in 1996. By 1999, over 1,800 bombs had reportedly been dropped on Iraq.
Legal status This military action was not authorised by the United Nations. The Secretary-General of the United Nations at the time the resolution was passed, Boutros Boutros-Ghali called the no-fly zones "illegal" in a February 2003 interview with John Pilger for ZNet. In 1998, France withdrew from the operation, with French Foreign Minister Hubert Vedrine saying that "there is no basis in international law for this type of bombing".
Civilian deaths The United Nations reported that in 1999 alone, 144 civilians had been killed during Coalition bombing efforts. An internal UN Security Sector report found that, in one five-month period, 41% of the victims were civilians.
Bosnia and Herzegovina, 1993–1995
In 1992, the United Nations Security Council passed United Nations Security Council Resolution 781, prohibiting unauthorized military flights in Bosnian airspace. This led to Operation Sky Monitor, where NATO monitored violations of the no-fly zone but did not take action against violators of the resolution. In response to 500 documented violations by 1993, including one combat violation, the Security Council passed Resolution 816, which prohibited all unauthorized flights and allowed all UN member states to "take all necessary measures ... to ensure compliance with [the no-fly zone restrictions]." This led to Operation Deny Flight, during which the Banja Luka incident, the shooting down of at least four of a flight of six Serbian jets, occurred; the engagement was not only the first combat engagement of the operation, but also the first combat engagement in the history of NATO. NATO later launched air strikes during Operation Deny Flight and during Operation Deliberate Force. As many as 400 NATO aircraft participated in the air campaign.
Libya, 2011
As part of the 2011 military intervention in Libya, the United Nations Security Council approved a no-fly zone on 17 March 2011. The resolution includes provisions for further actions to prevent attacks on civilian targets. On 24 March, NATO agreed to take control of the no-fly zone. Shortly thereafter, several NATO members proceeded to mount an aerial offensive campaign, in which numerous Libyan government positions would be intentionally bombed. Some NATO members did not contribute or did little to participate in the air campaign, leading to public criticism from US Secretary of Defense Robert Gates. The NATO no fly zone was terminated on 27 October after a unanimous vote by the UNSC, despite requests made by the Libyan National Transitional Council for its mission to be extended to the end of the year.
Libya, 2018 and 2019 A no-fly zone was declared by the Tobruk-based LNA over the country's south during its offensive in the region in 2018. It was later re-implemented for 10 days in 2019 as the LNA established control over oil fields in the region. The LNA declared another no-fly zone across the country's west during the 2019 Western Libya offensive.
Proposed No-Fly Zones
Discussion of a no-fly zone over Ukraine, 2022
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