The Tyumen Dispute was an armed conflict between the Union of Yuktobanian Republics and the Republic of Kaluga in 1986. Lasting for an unspecified period of time, the dispute concerned the Yuktobania-Kaluga border.
Not much is known about the dispute. The only known significant event is the Battle of Zhytomyr, in which the Yuktobanian Air Force's 9th Air Division, 112th Tactical Fighter Squadron engaged Kaluga's northern forces. Eighty percent of the Yuktobanian aircraft were destroyed, along with nearly the entire Kalugan force. It is unclear what became of the dispute afterward.