No Huns but there are Mongols as they were involved in Russian history for quite some time. And Germans are involved regarding West Slav history, Czech history is more german than slavic really as they were quite special member of Holy Roman Empire. If you mean germanic tribes like Goths, Vandals, Francs etc they are early chapters in the western middle age history for me.
Oh and Karlovci also cowers the beginning of Romanian Orthodox Church as under Austrian Monarchy all orthodox Christians were more or less part of serbian controlled church.