According to the representative of the team of the 29-year-old Russian, who reports TASS, the cancellation of the fight is associated with the poor health of the fighter.
The duel between Ulanbekov and Nam was supposed to take place at the UFC tournament in Las Vegas on June 19.
This is the second cancellation of the Russian's fight - in March he was unable to enter the octagon due to an operation to remove his appendix.
Ulanbekov's track record includes 13 victories and one defeat in his professional career.
It was previously reported that Rosenstrike knocked out Sakai in the UFC Vegas 28 main fight.