Ghost Recon begins in April 2008, with civil unrest in Russia borne out of an ultra-nationalist regime that came to power and placed its leader, Dmitri Arbatov, as president. The ultranationalists form the Russian Democratic Union (RDU) and conquer Ukraine, Belarus, and Kazakhstan, with eyes set on the other former Soviet republics.
During the first few missions of the game, the Ghosts battle Georgian rebels who are harassing the legitimate government and its allies. Their presence forces the Russian government to complain to the United Nations that the Americans have interfered in their affairs and eventually send in the army to aid the rebels. The Ghosts slow down the invading forces while foreign nationals evacuate the country. Eventually, the Ghosts are all that's left of US forces in Georgia and take the last helicopter out of the American Embassy in T'bilisi just as Russian forces storm the complex. The Georgian government flees to Geneva and sets up a government-in-exile while the RDU assimilates Georgia.
The Ghosts are later redeployed to the Baltic states in response to a Russian invasion launched three days ahead of intelligence estimates. The game's second campaign focuses on the Ghosts' efforts to slow down the invasion to buy time for NATO units to arrive in force, with the closest of them coming from Germany. The Ghosts fight alongside American forces to push the Russian Army out of the Baltics, with victories in Utena, Rezekne, and Vilnius. The loss of the Baltic states takes its toll on the RDU with Arbatov blamed for the disaster and put under house arrest.
The game's third and final campaign focuses on the Ghosts' forays into Russia, with their first mission being to free American and Russian POWs opposed to the government. The military executes President Arbatov which sparks a nationwide rebellion bordering on civil war. The ultra-nationalists quickly lose public support and many members of the RDU are also liberated...