The Riga Dispute

The Riga Dispute is a dispute between Zapadrussia and Talin about the Riga region. It also involves the Kurland dispute

Mainverse
Originally Talin ruled all of the Baltic states in the mainverse. However, Zapadrussia managed to gain de facto independence in Latvia. Talin has ever since claimed the area.

Kurland and Lithuania
Both Kurland and Lithuania are claimed by both Talin and Zapadrussia, but in Lithuania, there is a third party: Lithus.