This is the theme only from Sor’s famous duet for two guitars Souvenir de Russie op. 63 which he published in Paris in 1829/30. It is a well-known Russian melody.
Sor dedicated Souvenir de Russie to his younger colleague Napoléon Coste.
You can hear Souvenir de Russie played here by Claudio Maccari and Paolo Pugliese.