[5] At the 2014 European Athletics Championships, Tuka placed sixth in the men's 800 metres final, breaking his record by running a new personal best of 1:46.12.

[6] On 1 July 2015, Tuka won the men's 800 metres at the 20th Annual International Meeting in Velenje, Slovenia and qualified for the 2016 Summer Olympics by running 1:44.19.

[2] In the process, he earned a head-to-head victory over Olympic silver medalist Nigel Amos and defending World Champion Mohammed Aman.

[13] In the 800 metres, Tuka has developed a reputation for being a kicker because of his apparent speed at the end of the race, when in reality he runs even splits.

Tuka takes the beginning of the race out slowly, re-gaining contact with the rest of the field near the last 200 metres and ends with a strong finishing kick.