For anybody still questioning why the civilized word must stop Russia, i'd suggest to mediate a couple seconds over the parent comment (the commenter in the parent and in his other comments presents Russian position quite correctly)
The definition of which is quite wide https://en.m.wikipedia.org/wiki/Casualty_(person)
>"A casualty, as a term in military usage, is a person in military service, combatant or non-combatant, who becomes unavailable for duty due to any of several circumstances, including death, injury, illness, missing, capture or desertion."