Non-interventionism or non-intervention is a foreign policy that holds that political rulers should avoid alliances with other nations but still retain diplomacy and avoid all wars unless related to direct self-defense. An original, more formal definition is that non-interventionism is a policy characterized by the absence of "interference by a state or states in the external affairs of another state without its consent, or in its internal affairs with or without its consent".
This is based on the grounds that a state should not interfere in the internal politics of another state as well as the principles of state sovereignty and self-determination. A similar phrase is "strategic independence".
Historical examples of supporters of non-interventionism are US Presidents George Washington and Thomas Jefferson, who both favored non-intervention in European wars. Other proponents include United States Senator Robert A. Taft and former United States Representative Ron Paul.
Non-interventionism is distinct from and often confused with isolationism. Proponents of isolationism differ from proponents of non-interventionism through their advocacy of economic nationalism (called also protectionism) and immigration reduction. Non-interventionism is a policy in government only and thus does not exclude non-governmental intervention by organizations.
The norm of non-intervention has dominated the majority of international relations and can be seen to have been one of the principal motivations for the US's initial non-intervention into World Wars I and II, and the non-intervention of the liberal powers in the Spanish Civil War, despite the intervention of Germany and Italy. The norm was then firmly established into international law as one of central tenets of the United Nations Charter, which established non-intervention as one of the key principles which would underpin the emergent post-World War II peace.
However, this was soon affected by the advent of the Cold War, which increased the number and intensity of interventions in the domestic politics of a vast number of developing countries under pretexts such as instigating a "global socialist revolution" or ensuring "containment" of such a revolution. The adoption of such pretexts and the idea that such interventions were to prevent a threat to "international peace and security" allowed intervention under Chapter VII of the UN Charter. Additionally, the UN's power to regulate such interventions was hampered during the Cold War due to both the US and USSR holding veto power in the United Nations Security Council.
Mutual non-interference has been debut as one of China's principles on foreign policy in 1954. However, over the last six decades, while China has never explicitly strayed from rhetorical support for non-interference, it has frequently not practiced what it preached by involving border conflict with Vietnam, India and Korea. After Chinese economic reform, China begins to focus on industrial development, thus actively avoiding military conflict over the last three decades. As of February 2017, China has only used its veto eleven times in UN Security Council. Observers have noted a preference for China to abstain rather than veto on resolutions not directly related to Chinese interests.
In recent years, New Zealand has become largely non-interventionist. No military support, apart from medical, was given for the first Gulf War, although SAS troops were provided for the war in Afghanistan. Engineers were provided in Iraq after conventional hostilities in the war had ceased. In the Pacific Islands, New Zealand has been involved in humanitarian interventions in the Solomon Islands and East Timor. However, those interventions were non-coercive interventions at the request of the nation being intervened upon. These activities are known as "peace keeping".
Sweden has remained non-interventionist since the backlash against the king following Swedish losses in the Napoleonic Wars; the coup d'etat that followed in 1812 caused Jean Baptiste Bernadotte to establish a policy of non-intervention that has remained since the end of the Napoleonic Wars in 1815.
Switzerland has long been known for its policy of defensively armed neutrality.
In December 2013, the Pew Research Center reported that their newest poll, "American's Place in the World 2013", had revealed that 52 percent of respondents in the national poll said that the United States "should mind its own business internationally and let other countries get along the best they can on their own." This was the most people to answer that question this way in the history of the question, one which pollsters began asking in 1964. Only about a third of respondents felt this way a decade ago.
Since the end of the Cold War, new emergent norms of humanitarian intervention are challenging the norm of non-intervention. This is based upon the argument that, while sovereignty gives rights to states, there is also a responsibility to protect its citizens, an argument based upon social contract theory. Under this ideal, states can be justified in intervening within other states if that state is failing to protect (or if it is actively involved in harming) its citizens.
This idea has been used to justify the UN sanctioned intervention Operation Provide Comfort in Northern Iraq in 1991 to protect the Kurds, and, in Somalia, UNOSOM I and UNOSOM II from 1992 to 1995 in the absence of state power. However, after the US "Black Hawk Down" event in 1993 in Mogadishu, the US refused to intervene in Rwanda or Haiti. However, despite strong opposition from Russia and China, the idea of the responsibility to protect was again used to justify NATO intervention in Kosovo in 1999 and the 2011 military intervention in Libya.
This new norm of humanitarian intervention is not universally accepted and is often seen as still developing. In all of the UN-sanctioned cases, the arguments were further couched in Chapter VII threats to international peace and security. It has been suggested that this newly emerging norm is used to justify the action of states only if they want to act, rather than creating a moral duty of states to intervene.