Abkhazia and South Ossetia are to Georgia what Kosovo is to Serbia.

Serbia did not get Kosovo back did it?

Does russia support Chechnyan independence?

Obviously not. Neither do we (officially). Unofficially we do.

I don't know who "we" refers to here, but consider that Abkhazia and South Ossetia are to Georgia what Chechnya is to russia

And what Kalingrad is to Poland, and what Transnistria is to Moldova, and what Abkhazia and South Ossetia are to Georgia, and what Donetsk, Kherson, Luhansk, Zaporizhzhia, and Crimea are to Ukraine.

If you wish to understand this issue, you must condemn the russian invasions and annexations in Poland, Moldova, Georgia, Ukraine, and many others.