Second Star to the Right...
Weytahn is a small planet on the border between Vulcan and Andorian space, similar to Andoria in terms of its cold climate. The planet was terraformed by the Andorians in 2138 for use as an agricultural/mining colony. Over time, the Vulcan population in the colony grew to approximately 87%, at which point the Vulcan government annexed the planet in 2151.
The Andorians protested the annexation and have sought relief from the United Federation of Planets, but a recent appeal for the return of the planet was denied. The Andorians have imposed economic sanctions on the Vulcans as a result of this denial, and have threatened the use of military force if Weytahn is not returned to their control.