Foreign Relations

South Korea maintains diplomatic relations with more than 188 countries. The country has also been a member of the United Nations since 1991, when it became a member state at the same time as North Korea. On January 1, 2007, South Korean Foreign Minister Ban Ki-moon assumed the post of UN Secretary-General. It has also developed links with the Association of Southeast Asian Nations as both a member of ASEAN Plus three, a body of observers, and the East Asia Summit (EAS).
In 2010, South Korea and the European Union concluded a free trade agreement (FTA) to reduce trade barriers. South Korea is also negotiating a Free Trade Agreement with Canada,^[21] and another with New Zealand.^[22] In November 2009 South Korea joined the OECD Development Assistance Committee, marking the first time a former aid recipient country joined the group as a donor member. South Korea hosted the G-20 Summit in Seoul in November 2010.

China

Historically, Korea has had close relations with China. Before the formation of South Korea, Korean independence fighters worked with Chinese soldiers during the Japanese occupation. However, after World War II, the People's Republic of China embraced Maoism while South Korea sought close relations with the United States. The PRC assisted North Korea with manpower and supplies during the Korean War, and in its aftermath the diplomatic relationship between South Korea and the PRC almost completely ceased. Relations thawed gradually and South Korea and the PRC re-established formal diplomatic relations on August 24, 1992. The two countries sought to improve bilateral relations and lifted the forty-year old trade embargo, and^[23] South Korean–Chinese relations have improved steadily since 1992.^[23] The Republic of Korea broke off official relations with the Republic of China upon gaining official relations with the People's Republic of China.<sup>[24]

European Union</sup> 

The European Union (EU) and South Korea are important trading partners, having negotiated a free trade agreement for many years since South Korea was designated as a priority FTA partner in 2006. The free trade agreement has been approved in September 2010, following Italy's conditional withdrawal of its veto of the free trade agreement.^[25] The compromise made by Italy was that free trade agreement would take provisional effect on July 1, 2011. South Korea is the EU's eighth largest trade partner, and the EU has become South Korea's second largest export destination. EU trade with South Korea exceeded €65 billion in 2008 and has enjoyed an annual average growth rate of 7.5% between 2004 and 2008.^[26]
The EU has been the single largest foreign investor in South Korea since 1962, and accounted for almost 45% of all FDI inflows into Korea in 2006. Nevertheless, EU companies have significant problems accessing and operating in the South Korean market due to stringent standards and testing requirements for products and services often creating barriers to trade. Both in its regular bilateral contacts with South Korea and through its FTA with Korea, the EU is seeking to improve this situation.^[26]

Japan

Although there were no formal diplomatic ties between South Korea and Japan after the end of World War II, South Korea and Japan signed the Treaty on Basic Relations between Japan and the Republic of Korea in 1965 to establish diplomatic ties. There is heavy anti-Japanese sentiment in South Korea due to a number of unsettled Japanese-Korean disputes, many of which stem from the period of Japanese occupation after the Japanese annexation of Korea. During World War II, more than 100,000 Koreans were forced to serve in the Imperial Japanese Army.^[27][28] Korean women were forced to the war front to serve the Imperial Japanese Army as sexual slaves, called comfort women.^[29][30]
Longstanding issues such as Japanese war crimes against Korean civilians, the visits by Japanese politicians to the Yasukuni Shrine honoring Japanese soldiers killed at war (including some class A war criminals), the re-writing of Japanese textbooks related to Japanese acts during World War II, and the territorial disputes over Dokdo (Unofficial name: Liancourt Rocks)^[31] continue to trouble Korean-Japanese relations. Although Dokdo is claimed by both Korea and Japan, the islets are administered by South Korea, which has its Korean Coast Guard stationed there.^[32]
In response to then-Prime Minister Junichiro Koizumi's repeated visits to the Yasukuni Shrine, former President Roh Moo-hyun suspended all summit talks between South Korea and Japan.^[33]

North Korea

Both North and South Korea continue to officially claim sovereignty over the entire peninsula and any outlying islands. With longstanding animosity following the Korean War from 1950 to 1953, North Korea and South Korea signed an agreement to pursue peace.^[34] On October 4, 2007, Roh Moo-Hyun and North Korean leader Kim Jong-il signed an eight-point agreement on issues of permanent peace, high-level talks, economic cooperation, renewal of train services, highway and air travel, and a joint Olympic cheering squad.^[34]
Despite the Sunshine Policy and efforts at reconciliation, the progress was complicated by North Korean missile tests in 1993, 1998, 2006 and 2009. As of early 2009, relationships between North and South Korea were very tense; North Korea had been reported to have deployed missiles,^[35] ended its former agreements with South Korea,^[36] and threatened South Korea and the United States not to interfere with a satellite launch it had planned.^[37] North and South Korea are still technically at war (having never signed a peace treaty after the Korean War) and share the world's most heavily fortified border.^[8] On May 27, 2009, North Korean media declared that the Armistice is no longer valid due to the South Korean government's pledge to "definitely join" the Proliferation Security Initiative.^{[citation needed]} To further complicate and intensify strains between the two nations, the sinking of the South Korean warship Cheonan in March 2010, is affirmed by the South Korean government^[38] to have been caused by a North Korean torpedo, which the North denies. President Lee Myung-bak declared in May 2010 that Seoul would cut all trade with North Korea as part of measures primarily aimed at striking back at North Korea diplomatically and financially, except for the joint Kaesong Industrial Project, and humanitarian aid.^[39] North Korea initially threatened to sever all ties, to completely abrogate the previous pact of non-aggression, and to expel all South Koreans from a joint industrial zone in Kaesong, but backtracked on its threats and decided to continue its ties with South Korea. But despite the continuing ties, Kaesong industrial zone has seen a large decrease in investment and manpower as a result of this military conflict.
Timeline for 2010^[39]

• 26 March: South Korean warship Cheonan sinks, killing 46 sailors
• 20 May: Panel says a North Korean torpedo sank the ship; Pyongyang denies involvement
• July–September: South Korea and US hold military exercises; US places more sanctions on Pyongyang
• 29 September: North holds rare party congress seen as part of father-to-son succession move
• 29 October: Troops from North and South Korea exchange fire across the land border
• 12 November: North Korea shows US scientist new - undeclared - uranium enrichment facility
• 23 November: North shells island of Yeonpyeong, killing four South Koreans

United States

The United States engaged in the decolonization of Korea (mainly in the South, with the Soviet Union engaged in North Korea) from Japan after World War II. After three years of military administration by the United States, the South Korean government was established. Upon the onset of the Korean War, U.S. forces were sent to defend South Korea against invasion by North Korea and later China. Following the Armistice, South Korea and the U.S. agreed to a "Mutual Defense Treaty", under which an attack on either party in the Pacific area would summon a response from both.^[40] In 1967, South Korea obliged the mutual defense treaty, by sending a large combat troop contingent to support the United States in the Vietnam War. The U.S. Eighth Army, Seventh Air Force, and U.S. Naval Forces Korea are stationed in South Korea. The two nations have strong economic, diplomatic, and military ties, although they have at times disagreed with regard to policies towards North Korea, and with regard to some of South Korea's industrial activities that involve usage of rocket or nuclear technology. There had also been strong anti-American sentiment during certain periods, which has largely moderated in the modern day.^[41] In 2007, a free trade agreement known as the Republic of Korea-United States Free Trade Agreement (KORUS FTA) was reportedly signed between South Korea and the United States, but its formal implementation has been repeatedly delayed, pending further approval by the legislative bodies of the two countries.

Military

A long history of invasions by neighbors and the unresolved tension with North Korea have prompted South Korea to allocate 2.6% of its GDP and 15% of all government spending to its military (Government share of GDP: 14.967%), while maintaining compulsory conscription for men.^[42] Consequently, South Korea has the world's sixth largest number of active troops,^[43] the world's second-largest number of reserve troops^[43] and the eleventh largest defense budget. The Republic of Korea, with a regular military force numbering 3.7 million regular personnel among a total national population of 50 million people, has the second highest number of soldiers per capita in the world,^[43] after the Democratic People's Republic of Korea.^[44]

The South Korean military consists of the Army (ROKA), the Navy (ROKN), the Air Force (ROKAF), and the Marine Corps (ROKMC), and reserve forces.^[45] Many of these forces are concentrated near the Korean Demilitarized Zone. All South Korean males are constitutionally required to serve in the military, typically for a period of two years. Previously, Koreans of mixed race were exempt from military duty if they "look distinctively biracial", but such policy is potentially up for abolition pending further review by the Ministry of Defence.^[46]
In addition to male conscription in South Korea's sovereign military, 1000 Korean males are selected every year to serve two years in the KATUSA Program to further augment the USFK.^[47] In 2010, South Korea was spending ₩1.68 trillion in a cost-sharing agreement with the US to provide budgetary support to the US forces in Korea, on top the ₩29.6 trillion budget for its own military.
The South Korean army has 2,500 tanks in operation, including the K1A1 and K2 Black Panther, which form the backbone of the South Korean army's mechanized armor and infantry forces. A sizable arsenal of many artillery systems, including 1,700 self-propelled K55 and K9 Thunder howitzers, and 680 helicopters and UAVs of numerous types, are assembled to provide additional fire, reconnaissance, and logistics support. South Korea's smaller but more advanced artillery force and wide range of airborne reconnaissance platforms are pivotal in the counter-battery suppression of North Korea's over-sized artillery force, which operates more than 13,000 artillery systems deployed in various state of fortification and mobility.^[43][48]
The South Korean navy has made its first major transformation into a blue-water navy through the formation of the Strategic Mobile Fleet, which includes a battle group of Chungmugong Yi Sun-sin class destroyers, Dokdo class amphibious assault ship, AIP-driven Type 214 submarines, and King Sejong the Great class destroyers, which is equipped with the latest baseline of Aegis fleet-defense system that allows the ships to track and destroy multiple cruise missiles and ballistic missiles simultaneously, forming an integral part of South Korea's indigenous missile defense umbrella against the North Korean military's missile threat.^[49]
The South Korean air force operates 840 aircrafts, making it world's ninth largest air force, including several types of advanced fighters like F-15K, heavily modified KF-16C/D,^[50] and the indigenous F/A-50,^[51][52] supported by well-maintained fleets of older fighters such as F-4E and KF-5E/F that still effectively serve the air force alongside the more modern aircraft. In an attempt to gain strength in terms of not just numbers but also modernity, the commissioning of four Boeing 737 AEW&C aircraft, under Project Peace Eye for centralized intelligence gathering and analysis on a modern battlefield, will enhance the fighters' and other support aircraft's ability to perform their missions with awareness and precision.
On May 2011, Korea Aerospace Industries Ltd., South Korea's largest plane maker, signed a $400 million deal to sell 16 T-50 Golden Eagle trainer jets to Indonesia, marking South Korea as the first time for the country in Asia to export supersonic jets.^[53]

From time to time, South Korea has sent its troops overseas to assist American forces. It has participated in most major conflicts that the United States has been involved in the past 50 years. South Korea dispatched 325,517 troops to fight alongside American, Australian, Filipino, New Zealand and South Vietnamese soldiers in the Vietnam War, with a peak strength of 50,000. In 2004, South Korea sent 3,300 troops of the Zaytun Division to help re-building in northern Iraq, and was the third largest contributor in the coalition forces after only the US and Britain.^[54] Beginning in 2001, South Korea had so far deployed 24,000 troops in the Middle East region to support the War on Terrorism. A further 1,800 were deployed since 2007 to reinforce UN peacekeeping forces in Lebanon.
The United States have stationed a substantial contingent of troops in South Korea since the Korean War to defend South Korea in case of East Asian military crises. There are approximately 28,500 U.S. Military personnel stationed in Korea,^[55] most of them serving one year of unaccompanied tours. The American troops, which primarily are assigned to the Eighth United States Army are stationed in installations at Osan, Yongsan, Dongducheon, Sungbuk, and Daegu. A still functioning UN Command is technically the top of the chain of command of all forces in South Korea, including the US forces and the entire South Korean military – if a sudden escalation of war between North and South Korea were to occur the United States would assume control of the South Korean armed forces in all military and paramilitary moves. However, in September 2006, the Presidents of the United States and the Republic of Korea agreed that South Korea should assume the lead for its own defense. In early 2007, the U.S. Secretary of Defense and ROK Minister of National Defense determined that South Korea will assume wartime operational control of its forces on April 17, 2012. U.S. Forces Korea will transform into a new joint-warfighting command, provisionally described as Korea Command (KORCOM).^[56]