There's a lot of tunes and songs with that name. A sorrowful song "There Flies the Mail Coach" has "troika" in its original title (Click here for lyrics & English translation; Click here for score). Some dance tunes are:
1. "Troika" on 20 Jukebox Party Dance Favorites
2. "Troika" on All the Best Folk Dances of the World; International Folk Dance Mixer; Russia; and Songs from Russia
3. "Polka - Troika" on Songs & Dances from Belorussia
~Masato