There were wars between 2 sides of Georgia before, one in 1992, another was 2004. Russia didn't directly send troops in those 2 conflicts. It is Georgia's NATO anouncement from Bucharest summit that made Russia send the troops and permanently stay in Georgia's Russian population area. This move disqualified Georgia to become a NATO member since NATO requirement for it's member is that no military conflict with other countries on it's soil.
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