BT has some strange routing rules in their fares from Finland (also works ex some other countries) to Norrkoping, Sweden, which leads to a good deal in business class to Georgia, Azerbaijan, Ukraine, Russia etc. Example below from Helsinki, Finland to Tbilisi, Georgia to Norrkoping, Sweden is €394, 3725 BIS-miles, double that for a return trip (or you can fly FC/AY one-way NRK-HEL for €50).

BT 306 D 15OCT 4 HELRIX HK1 1550 1655
BT 722 D 15OCT 4 RIXTBS HK1 2025 0055+1
BT 723 D 16OCT 5 TBSRIX HK1 0325 0600
BT 131 D 16OCT 5 RIXCPH HK1 0700 0730
QI 773 D 16OCT 5 CPHNRK HK1 1420 1515

Full routing rules:
HEL-RIX/VNO-TLL/BAK/GME/IEV/KGD/KIV/LED/MOW/MSQ/ODS/SIP/TBS-RIX/VNO-CPH-SK/QI-NRK

Fare basis
DFIOWTHR, €292++, fully refundable and changeable, unlimited stopovers. Economy class is €100 cheaper.

Available through any decent travel agent (or maybe online?).