Swiss neutrality is one of the main principles of Switzerland's foreign policy which dictates that Switzerland is not to be involved in armed or political conflicts between other states. This policy is self-imposed and designed to ensure external security and promote peace.
Although the European powers (Austria, France, the United Kingdom, Portugal, Prussia, Russia, Spain and Sweden) agreed at the Congress of Vienna in May 1815 that Switzerland should be neutral, final ratification was delayed until after Napoleon Bonaparte was defeated so that some coalition forces could invade France via Swiss territory.
The country has a history of armed neutrality going back to the Reformation; it has not been in a state of war internationally since 1815 and did not join the United Nations until 2002. It pursues an active foreign policy and is frequently involved in peace-building processes around the world.
According to Swiss president Ignazio Cassis in 2022 during a World Economic Forum speech, the laws of neutrality for Switzerland are based on the Hague agreement principles which include “no participation in wars; international cooperation but no membership in any military alliance; no provision of troops or weapons to warring parties and no granting of transition rights.” 
The beginnings of Swiss neutrality can be dated back to the defeat of the Old Swiss Confederacy at the Battle of Marignano in September 1515 or the peace treaty the Swiss Confederacy signed with France on November 12, 1516.: 241 Prior to this, the Swiss Confederacy had an expansionist foreign policy.
The Peace of Westphalia in 1648 was another important step in the development of Switzerland's neutrality.: 242 Other countries were disallowed from passing through Swiss territory, and the Confederation became legally independent from the Holy Roman Empire,: 242 even though it had been independent from the Empire de facto since 1499.
The 1798 invasion of Switzerland by the French First Republic culminated in the creation of a satellite state called the Helvetic Republic. While the 1798 Swiss constitution and the 1803 Act of Mediation stated that France would protect Swiss independence and neutrality, these promises were not kept.: 245 With the latter act, Switzerland signed a defensive alliance treaty with France.: 245 During the Restoration, the Swiss Confederation's constitution and the Treaty of Paris's Act on the Neutrality of Switzerland affirmed Swiss neutrality.: 246 
The dating of neutrality to 1516 is disputed by modern historians. Prior to 1895, no historian referenced the Battle of Marignano as the beginning of neutrality. The later backdating has to be seen in light of threats by several major powers in 1889 to rescind the neutrality granted to Switzerland in 1815. A publication by Paul Schweizer, titled Geschichte der schweizerischen Neutralität attempted to show that Swiss neutrality wasn't granted by other nations, but a decision they took themselves and thus couldn't be rescinded by others. The later publication of the same name by Edgar Bonjour, published between 1946 and 1975, expanded on this thesis.
The World Wars
World War I
During the First World War, Switzerland sustained its policy of neutrality despite sharing land borders with two of the Central Powers (Germany and Austria-Hungary) and two of the Allied Powers (France and Italy). The German-speaking majority in Switzerland generally favoured the Central Powers whilst the French-speaking and Italian-speaking populations favoured the Allied Powers. This sparked internal tensions; however, the country was able to maintain its neutrality.
In 1917, the neutrality of Switzerland was brought into question by the Grimm-Hoffmann Affair. Robert Grimm, a Swiss socialist politician, visited Russia in an attempt to negotiate a separate peace agreement between Russia and Germany, in order to end the war on the Eastern Front in the interests of socialism. Grimm was supported by Arthur Hoffman, a Swiss Federal Councillor who was in charge of the Political Department and headed the Foreign Ministry. However, Hoffman had not consulted his fellow Councillors over this initiative, and when a telegram sent between Grimm and Hoffman was made public, the Allied Powers were outraged.
The League of Nations formally recognized Swiss neutrality on February 13, 1920. While the policy was not universally admired, it was respected by other countries. As a tribute, the world organization even chose Geneva as its headquarters. It also exempted Switzerland from military obligations. However, the country was forced to adopt the so-called "differential neutrality", which required Switzerland to participate in economic sanctions while preserving its military neutrality, a policy initially welcomed to establish the Swiss solidarity with international efforts to promote a peaceful world order. By March 1938, however, the Swiss government was increasingly becoming averse to this type of neutrality and reverted to absolute neutrality. The shift was not only a case of the Swiss realizing the value of their traditional policies but was also attributed to the deteriorating European economic and political relations in a period preceding World War II.
World War II
Switzerland found itself completely surrounded by the Axis powers and Axis-controlled territory for most of World War II. Nazi Germany planned an invasion of Switzerland, and Switzerland made preparations for such an occurrence. At one point, Switzerland mobilized 850,000 soldiers. Under the leadership of Henri Guisan, Switzerland developed its National Redoubt plan in case of an invasion.
Although Switzerland was criticized by many for its ambiguous stance during World War II, its neutrality has been appreciated on several occasions by both European and non-European leaders.
From 1943 Switzerland stopped American and British aircraft, mainly bombers, overflying Switzerland during the Second World War. On numerous occasions during the war, Allied aircraft trespassed on Swiss airspace; mostly damaged Allied bombers returning from raids over Italy and Germany whose crews preferred internment by the Swiss to becoming prisoners of war. Over a hundred Allied aircraft crews were interned and placed in ski resorts which were left abandoned due to the lack of tourists after the outbreak of war. They were to be held in there until the war had ended. At least 940 American airmen attempted to escape into France after the invasion of Normandy, but Swiss authorities intercepted 183 internees. Over 160 of these airmen were incarcerated in a Swiss prison camp known as Wauwilermoos, which was located near Lucerne and commanded by André Béguin, a pro-Nazi Swiss officer. The American internees remained in Wauwilermoos until November 1944 when the U.S. State Department lodged protests against the Swiss government and eventually secured their release.
Switzerland was surrounded by Axis-controlled territory; this meant that they also suffered from Allied bombings during the war – an example of this would be when Schaffhausen was accidentally bombed by American planes on April 1, 1944, the town was mistaken for Ludwigshafen am Rhein, a German town 284 kilometres away.
These bombing incidents tested the neutrality of Switzerland as it showed the leniency of the Swiss towards Allied airspace violations. The bombings persisted and eventually Switzerland declared a zero-tolerance policy for violation by either Axis or Allied aircraft and authorised attacks on American aircraft.
The Swiss, although somewhat skeptical, reacted by treating these violations of their neutrality as "accidents". The United States was warned that single aircraft would be forced down, and their crews would still be allowed to seek refuge, while bomber formations in violation of airspace would be intercepted. While American politicians and diplomats tried to minimise the political damage caused by these incidents, others took a more hostile view. Some senior commanders argued that as Switzerland was "full of German sympathisers", it deserved to be bombed. General Henry H. Arnold, Commanding General of the U.S. Army Air Forces, even suggested that it was the Germans themselves who were flying captured Allied planes over Switzerland in an attempt to gain a propaganda victory.
Following World War II, Switzerland began taking a more active role in humanitarian activities.
It joined the United Nations after a March 2002 referendum. 10 years after Switzerland joined the UN, in recorded votes in the United Nations General Assembly, Switzerland occupied a middle position, siding from time to time with member states like the United States and Israel, but at other times with countries like China. In the United Nations Human Rights Council Switzerland sided much more with Western countries and against countries like China and Russia.
Switzerland participated in the development of the International Code of Conduct for Private Security Service Providers (ICoC), intended as an oversight mechanism of private security providers. In September 2015, a "Federal Act on Private Security Services provided Abroad" was introduced, in order to "[preserve] Swiss neutrality", as stated in its first article. It requires Switzerland-based private security companies to declare all operations conducted abroad, and to adhere to the ICoC. Moreover, it states that no physical or moral person falling under this law can participate directly—or indirectly through the offer of private security services—in any hostilities abroad. In 2016, the Section of Private Security Services (SPSS), an organ of the Federal Department of Foreign Affairs in charge of the procedures defined by the new law, has received 300 approval requests.
In 2011, Switzerland registered as a candidate for a seat on the United Nations Security Council in 2023–2024. In a 2015 report requested by parliament, the government stated that a Swiss seat on the Security Council would be "fully compatible with the principles of neutrality and with Switzerland’s neutrality policy". Opponents of the project such as former ambassador Paul Widmer consider that this seat would "put its [Switzerland] neutrality at risk".
A 2018 survey found that 95% of Swiss were in favor of maintaining neutrality.
Conflicts in the Middle East
The Swiss Armed Forces participated in the U.S.-led War in Afghanistan as observers, in what the Swiss Broadcasting Corporation described as the nation’s "first military deployment since 1815." During the 2003 invasion of Iraq, the United States was given permission to use Swiss airspace for surveillance missions over Iraq.
Russian invasion of Ukraine (2022)
In 2022, Switzerland imposed sanctions against Russia in response to the Russian invasion of Ukraine. While Switzerland follows defined rules to remain neutral in military conflicts, it imposed sanctions for this "serious violation of the most fundamental norms of international law [...] within the scope of its political room for manoeuvre." According to federal councilor Viola Amherd, Switzerland is only involved in humanitarian missions and will not allow direct shipments of arms to the war zone from or through its territory. Irrespective of the actual laws governing a neutral country, many media outlets still labelled this as a break with 500 years of Swiss neutrality. Russia perceived the sanctions in a similar way, as it rejected Switzerland's offer to mediate the conflict.
In March 2022, former Swiss councilor Christoph Blocher announced the ballot initiative 'Pro Souveräne Schweiz' (PSS), which would amend "integral neutrality" to the Swiss constitution. If approved, economic sanctions for example against Russia in 2022, would constitute a violation of Swiss neutrality. The initiative scheduled to be launched in fall 2022 is supported by the right-leaning Swiss People's Party (SVP).
In April 2022, the Federal Department of Economic Affairs vetoed Germany's request to re-export Swiss ammunition to Ukraine on the basis of Swiss neutrality. The defence ministry of Switzerland, initiated a report in May 2022 analyzing various military options, including increased cooperation and joint military exercises with NATO. However, NATO membership remains unpopular. A poll from March 2022 found that 27% of those surveyed supported Switzerland joining NATO, while 67% were opposed. Another from May 2022 indicated 33% of Swiss supported NATO membership for Switzerland, and 56% supported increased ties with NATO.
Swiss neutrality has been questioned at times, notably regarding Switzerland's role during World War II and the ICRC, the looted Nazi gold (and later during Operation Gladio), its economic ties to the apartheid regime in South Africa, and more recently in the Crypto AG espionage case.
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