Indonesia–Singapore relations
Indonesia and Singapore established diplomatic relations (; ; ; )) on 7 September 1967, a month after the formation of the Association of Southeast Asian Nations (ASEAN) on 8 August 1967. Indonesia and Singapore are two of the five founding members of ASEAN (including Malaysia, Thailand, Philippines). Both nations are also members of the Non-Aligned Movement and APEC. Over the years, Indonesia and Singapore have maintained regular exchanges of high-level visits, underpinned by strong economic cooperation across a wide range of sectors, including health, defence and the environment. In the past decade, Singapore has consistently been Indonesia's top  foreign investor. 2017 mark the 50th anniversary of their diplomatic relations in a celebration event known as RISING50, an amalgamation of “RI” for the Republic of Indonesia and “SING” for Singapore. History. The relations between ancient Indonesia and Singapore dated back from the period of ancient kingdoms, the straits region was part of Srivijaya’s realm back in 7th century. The Nagarakretagama, a Javanese epic poem written in 1365 during Majapahit era, also referred to a settlement on the island called Temasek ('Sea Town' in Old Javanese, spelt "Tumasik"). In the 1390s, a Palembang prince, Parameswara, fled to Temasek after  being deposed by the Majapahit kingdom. During the 14th century, Singapore was caught in the struggle between Siam (now Thailand) and the Java-based Majapahit Empire for control over the Malay Peninsula. According to Sejarah Melayu, Singapore was defeated in one Majapahit attack. He ruled the island for several years, before being forced to Melaka where he founded the Sultanate of Malacca. In early 19th century, Singapore was under British control as Straits Settlements and later as Crown colony, while at the same period Indonesian archipelago gradually fell under control of Dutch East Indies Company and Dutch East Indies. In  early 1965, a group of Indonesian soldiers blew up a building in Singapore (while it was still a part of Malaysia). Two of the soldiers were arrested and sentenced to death. After the independence of Indonesia in 1945 and the separation of Singapore from Malaysia in 1965, both countries opened bilateral diplomatic ties on 1966. In 1967, they founded ASEAN together with Thailand, Philippines and Malaysia, to strive for peace and stability in the region. Formal diplomatic relations was established between Singapore and Indonesia on 7 September 1967. 50th anniversary of formal diplomatic relations. The golden jubilee of Indonesia-Singapore  diplomatic relations was marked by a series of events in August: A "four-eye" meeting between the two leaders, "RISING50" book launch, joint commemorative stamps issue, tree planting at the Singapore Botanic Gardens. The first ever combined flypast of 20 fighter jets from the Republic of Singapore Air Force (RSAF) and Tentara Nasional Indonesia-Angkatan Udara (TNI-AU) was also held, in a formation of the number "50". On the economic front, an investment forum was held and nine memoranda of understandings(MOUs) were signed, including cooperations in education and research, student exchanges, environment and energy. Trade and commerce. Located on  the busiest sea lane in Strait of Malacca, serving as one of world's main hub, trade with and through Singapore is important for Indonesia to provide the link to trade with the rest of the world. Vice versa, Indonesian business is also important for Singapore. Trade and commerce is the main common motivation of both nations foreign relations, each counterpart are main trade partners of each other. Indonesia-Singapore trade volume reaches S$36 billion (US$29.32 billion). Singapore is Indonesia's top foreign investor, with a cumulative total of US$1.14 billion in 142 projects. Trade between the two  countries also hit around $68 billion in 2010. At the same time, Indonesia's non-oil and gas exports to Singapore are the highest in the region. Tourism. Singapore is Indonesia's number one source of visitors with 1,373,126 visitors in 2010. Vice versa, Indonesia is also top source of visitors for Singapore, reaching 2,592,222 visitors in 2011. Other than business purposes, Indonesian visitors attracted to Singapore mostly for shopping, city sightseeing, and island resorts with its theme parks, zoos, museums and gardens. While Singaporeans attracted to Indonesia mostly for its nature and culture, Bali and neighboring Batam island  are particularly popular among Singapore visitors. Security, counter terrorism and border. On 3 October 2005, Prime Minister Lee Hsien Loong met Indonesian President Susilo Bambang Yudhoyono in Bali, just two days after the Bali bombings. They agreed to strengthen the fight against terrorism and also discussed cooperation in the fields of economy, trade, energy and investment. Territorial and environment issues. Relations with Indonesia are generally good, though current outstanding issues include the bans on the export of sand and granite, both of which Singapore's construction industry is reliant on. Singapore scarcity of land and spaces have led them to  expand their island through land reclamations. The materials needed for reclamation, sands and granites, are mostly imported from Indonesia. The quarry of sands from Indonesian territories has raised concern over environmental issues. In August 2005, Singapore and Indonesia signed a Memorandum of Understanding to expand aviation rights between the two countries. In June 2013, Singapore suffers the haze coming from slash-and-burn practice to clear plantation lands in neighboring Riau, Sumatra, Indonesia. The June 2013 haze hit the worst record, reaching the highest haze pollutant levels since 1997. The haze has prompted a health alert from the Singaporean government , angered Singaporean citizens and also caused some diplomatic tension as the Singaporean government protested Indonesia's tardiness at handling the issue and urged the Indonesian government to look for effective measures to mitigate the transboundary haze pollution occurrence. In addition, there has also been differences between both countries on the administration of the Riau Islands Flight Information Region (FIR). Singapore has generally claimed that it controls the FIR based on an arrangement made by the International Civil Aviation Organization, and that it is a matter of aviation safety and efficiency. However, some past and present Indonesian officials have argued against  Singapore's right to do so, and reasoned that the FIR is a critical determinant of Indonesia's air sovereignty and defense. In January 2022, the 5th Singapore-Indonesia Leader's Retreat held at Sanchaya Resort in Bintan saw the signing of three agreements addressing bilateral issues of FIR, defence cooperation and extradition of fugitives, that are important to both sides. Under the agreement on airspace management, Singapore and Indonesia have agreed to realign the boundary between Jakarta Flight Information Region (FIR) and Singapore FIR. Indonesia will delegate to Singapore the provision of air navigation services in portions of the  airspace within the realigned Jakarta FIR. This agreement will remain in force for 25 years and can be extended by mutual consent. Under the Defence Cooperation Agreement, Singapore and Indonesia will continue to strengthen defence partnerships and deepen cooperation in mutually beneficial areas. The agreement will be in force for 25 years. Under the Extradition Treaty, Singapore and Indonesia will grant extradition for a comprehensive list of extraditable offences covered by the treaty. The signing of agreements is seen to be a win-win outcome for both countries.