This is stated in the post on the page of the Transcarpathian Legion on Facebook:
"Today, around 11 o’clock, on May 15, 2018, during military training in the military unit A1556 (Mukacheve) on the Uzhgorod section of the range, two combat vehicles collided. As a result, four servicemen received injuries of varying severity.
The injured soldiers were promptly provided with the first medical aid by the medics of the military unit. Then, they were taken to the Transcarpathian Regional Clinical Hospital.
The lives of the soldiers are not in danger.
A military investigation is planned to be conducted by the command of the military unit, following which appropriate measures will be taken."