While some outlets have been reporting the claim that a large number of Ukranian mercenaries were killed in Sudan, these outlets are far from major and/or reputable. These outlets include Military Watch Magazine, an outlet that has gained scrutiny for publishing Russian propagandist views. Africanews, a somewhat reputable publication, said the claims orginated from the Sudanese Armed Forces, but noted that they "could not be independently verified." Furthermore, they noted that these claims had not been confirmed or denied by any governments involved.
Since the claims have not been independently verified, and originate from a military source, it is hard to determine their veracity. The Guardian did report more than a year ago that Ukranian Special Forces were engaged in conflict with Russian forces in Ukraine. However, it is hard to find record of Ukranian troops, military or mercenary, operating in Sudan since.
Because of the low level of trusted news coming out of Sudan, and the lack of information regarding Ukranian mercenaries in the country prior to these claims, they can be considered inconclusive. Ukraine does have a past in Sudan, but there is just not enough reliable information to consider these claims true or false.
