stylistic:tone, information:extraction, linguistic:paraphrasing
1989–2008

Tensions in the region began to rise amid rising nationalism among both Georgians and Ossetians in 1989. Before this, the two communities of the South Ossetian Autonomous Oblast of the Georgian SSR had been living in peace with each other except for the 1918–1920 events. Both ethnicities had a normal degree of interaction and there were many Georgian-Ossetian intermarriages.

The dispute surrounding the presence of the Ossetian people in the South Caucasus has been one of the causes of conflict. Although Georgian historiography believes that Ossetian mass migration to the South Caucasus (Georgia) began in the 17th century, Ossetians claim to have been residing in the area since the ancient times, which is not supported by available sources. Some Ossetian historians accept that the migration of Ossetian ancestors to modern South Ossetia began after the Mongol invasions of the 13th century, while one South Ossetian de facto foreign minister in the 1990s said that the Ossetians first appeared in the area only in the early 17th century. Since it was created after the Russian invasion of 1921, South Ossetia was regarded as artificial creation by Georgians during the Soviet era.

The South Ossetian Popular Front (Ademon Nykhas) was created in 1988. On 10 November 1989, the South Ossetian regional council asked the Georgian Supreme Council to upgrade the region to the status of an " autonomous republic ". The decision to transform the South Ossetian AO into the South Ossetian ASSR by the South Ossetian authorities escalated the conflict. On 11 November, this decision was revoked by the Georgian parliament, the Supreme Soviet. The Georgian authorities removed the First Party Secretary of the oblast from his position.

The Georgian Supreme Council adopted a law barring regional parties in summer 1990. The South Ossetian regional council interpreted this as a move against Ademon Nykhas and subsequently passed a "declaration of national sovereignty", proclaiming the South Ossetian Soviet Democratic Republic within the Soviet Union on 20 September 1990. Ossetians boycotted subsequent Georgian parliamentary elections and held their own contest in December.

In October 1990, the parliamentary election in Georgia was won by Zviad Gamsakhurdia 's "Round Table" block. On 11 December 1990, Zviad Gamsakhurdia's government declared the Ossetian election illegitimate and abolished South Ossetia's autonomous status altogether. Gamsakhurdia rationalised the abolition of Ossetian autonomy by saying, "They have no right to a state here in Georgia. They are a national minority. Their homeland is North Ossetia.... Here they are newcomers."

When the Georgian parliament declared a state of emergency in the territory of South Ossetian AO on 12 December 1990, troops from both Georgian and Soviet interior ministries were sent to the region. After the Georgian National Guard was formed in early 1991, Georgian troops entered Tskhinvali on 5 January 1991. The 1991–1992 South Ossetia War was characterised by general disregard for international humanitarian law by uncontrollable militias, with both sides reporting atrocities. The Soviet military facilitated a ceasefire as ordered by Mikhail Gorbachev in January 1991. In March and April 1991, Soviet interior troops were reported actively disarming militias on both sides, and deterring the inter-ethnic violence. Zviad Gamsakhurdia asserted that the Soviet leadership was encouraging South Ossetian separatism in order to force Georgia not to leave the Soviet Union. Georgia declared its independence in April 1991.

As a result of the war, about 100,000 ethnic Ossetians fled the territory and Georgia proper, most across the border into North Ossetia. A further 23,000 ethnic Georgians fled South Ossetia to other parts of Georgia. Many refugees went to the North Ossetian Prigorodnyi District. In 1944, many South Ossetians were resettled in areas of North Ossetia from which the Ingush had been expelled by Stalin in 1944. In the 1990s the new wave of South Ossetians migrating to the former Ingush territory fuelled conflict between Ossetians and Ingush.

On 29 April 1991, the western part of South Ossetia was affected by an earthquake, which killed more than 200 and left tens of thousands homeless.

In late 1991, dissent was mounting against Gamsakhurdia in Georgia due to his intolerance of critics and attempts to concentrate political power. On 22 December 1991, after a coup d'état, Gamsakhurdia and his supporters were besieged by the opposition, which was backed by the national guard, in several government buildings in Tbilisi. The ensuing heavy fighting resulted in over 200 casualties and left the center of the Georgian capital in ruins. On 6 January, Gamsakhurdia and several of his supporters fled the city for exile. Afterwards, the Georgian military council, an interim government, was formed by a triumvirate of Jaba Ioseliani, Tengiz Kitovani and Tengiz Sigua, and, in March 1992, they invited Eduard Shevardnadze, a former Soviet minister, to come to Georgia to assume control of the Georgian State Council.

An independence referendum was held in South Ossetia on 19 January 1992, with voters being asked two questions: "Do you agree that South Ossetia should be an independent country?" and "Do you agree with the South Ossetian parliament's solution of 1 September 1991 on reunion with Russia?" Both proposals were approved, but the results were not recognised internationally. Nonetheless, the South Ossetian regional council subsequently passed an "act of state independence" and declared the independence of the Republic of South Ossetia on 29 May 1992.

On 24 June 1992, Shevardnadze and the South Ossetian government signed the Sochi ceasefire agreement, brokered by Russia. The agreement included obligations to avoid the use of force, and Georgia pledged not to impose sanctions against South Ossetia. The Georgian government retained control over substantial portions of South Ossetia, including the town of Akhalgori. A Joined Peacekeeping force of Ossetians, Russians and Georgians was established. On 6 November 1992, the Organization for Security and Co-operation in Europe (OSCE) set up a mission in Georgia to monitor the peacekeeping operation. From then until mid-2004, South Ossetia was generally peaceful.

Following the 2003 Rose Revolution, Mikheil Saakashvili became the President of Georgia in 2004. Ahead of the 2004 parliamentary and presidential elections, he promised to restore the territorial integrity of Georgia. During one of his early speeches, Saakashvili addressed the separatist regions, saying, "either Georgia nor its president will put up with disintegration of Georgia. Therefore, we offer immediate negotiations to our Abkhazian and Ossetian friends. We are ready to discuss every model of statehood by taking into consideration their interests for the promotion of their future development."

Since 2004, tensions began to rise as the Georgian authorities strengthened their efforts to bring the region back under their rule, after it succeeded in Adjara. Georgia sent police to close down the Ergneti black market, which was one of the region's chief sources of revenue, selling foodstuffs and fuel smuggled from Russia. The Georgian authorities claimed the massive smuggling of goods for the Ergneti market through the Roki Tunnel, which was not under Georgian control, cost the country significant amounts of custom revenues. Georgia proposed to bring the Roki tunnel under joint control and monitoring, which was refused by the South Ossetian side. The antismuggling operation against the market resulted in a breakdown of South Ossetian trust in Georgia's intentions. A wave of violence erupted between Georgian peacekeepers and South Ossetian militiamen and freelance fighters from Russia. This included hostage taking of dozens of Georgian peacekeepers, shootouts and shelling of Georgian controlled villages, which left dozens dead and wounded. A ceasefire deal was reached on 13 August though it was repeatedly violated.

The Georgian government protested against the allegedly increasing Russian economic and political presence in the region and against the uncontrolled military of the South Ossetian side. Georgian government officials have stated South Ossetian key security positions are occupied by (former) Russian security officials, while some political researchers speak of institutions being outsourced to the Russian Federation.

It also considered the peacekeeping force (consisting in equal parts of South Ossetians, North Ossetians, Russians and Georgians) to be non-neutral and demanded its replacement. Various proposals were launched by the Georgian side to internationalise the peacekeeping in South Ossetia. According to U.S. senator Richard Lugar, the United States supported Georgia's call in 2006 for the withdrawal of Russian "peacekeepers" from the conflict zones. Later, EU South Caucasus envoy Peter Semneby said that "Russia's actions in the Georgia spy row have damaged its credibility as a neutral peacekeeper in the EU's Black Sea neighbourhood." Joe Biden (Chairman, U.S. Senate Foreign Relations Committee), Richard Lugar, and Mel Martínez sponsored a resolution in June 2008 accusing Russia of attempting to undermine Georgia's territorial integrity and called for replacing the Russian-comprised peacekeeping force operating under CIS mandate.