The Russo-Georgia conflict involving Russia, Georgia, and the two regions South Ossetia and Abkhazia. The two regions have been trying to get formal independence since the 1990s — Russia recognizes the independence, which has been condemned by Western nations.
"After the 2008 conflict, Moscow declared that it would formally recognize the independence of both South Ossetia and Abkhazia. Russia's allies Nicaragua and Venezuela followed suit, as did a number of small Pacific island states," according to the BBC.
Internationally, South Ossetia is still considered to be "officially part of Georgia." And Georgia considers Abkhazia to be a "breakaway region."
Source: BBC