Crimea itself decided its fate.
Ukraine has killed 10 000 people in Donbas.
The figure most probably refers to the overall number of casualties during the war in Ukraine.
In total, from 14 April 2014 to 15 November 2017, OHCHR recorded 35,081 conflict-related
casualties in Ukraine among Ukrainian armed forces, civilians and members of the armed
groups. This includes 10,303 people killed and 24,778 injured. reliefweb.int/sites/reliefweb.int/files/resources/UAReport20th_EN.pdf,
According to the OHCHR, during the entire conflict period, from 14 April 2014 to 15 May 2018, at least 2,725 civilians have been killed: 1,568 men, 961 women, 93 boys, 47 girls and 56 adults whose sex is unknown. An additional 298 civilians, including 80 children, were killed by the downing of flight MH17 on 17 July 2014, bringing the total death toll on civilians to at least 3,023. OHCHR estimates the total number of conflict-related civilian injuries to be between 7,000 and 9,000. www.ohchr.org/Documents/Countries/UA/ReportUkraineFev-May2018_EN.pdf,
OHCHR does not state which side is responsible for the casualties.