Possible Clues:

• Old pol. divisions
• Former polit. divisions
• Lith. and Ukr., once
• Ukr. and Lith., once
• Lith. and Lat., once
• Lat. and Lith., once
• Georgia et al., once
• Georgia et al., once: Abbr.
• Lat. and Ukr., once
• The Baltics, once: Abbr.