"We are sad to say that today, on January 17, during a combat mission in the Luhansk sector, two servicemen of the Ukrainian Armed Forces received injuries incompatible with life as a result of a blast of military equipment while running over an unknown explosive device. Another five our soldiers were wounded," the ATO HQ wrote on Facebook on Wednesday.

Read alsoUkraine reports 2 WIA's amid three enemy attacks in last dayThe wounded are in a satisfactory condition. All of them were rushed to hospital where they received all the necessary medical assistance.

"The command of the Anti-Terrorist Operation forces expresses condolences to the relatives and friends of the deceased defenders who gave their lives for Ukraine," the headquarters said.

The causes and details of the incident are being investigated. ATO HQ investigators are working on the scene, the press center said.