In April 2023 116 Russian military personnel were convicted of murder - 900% higher than the previous year.
The same time this year, Russian media outlet Vertska reported that 190 former convicts were prosecuted again in criminal cases - 20 of whom were for murder or attempted murder.
One of those included an ex-Wagner prisoner who was sentenced to 22 years after murdering an elderly woman after his release.*
The UK's Ministry of Defence puts this high number of murders by serving and veteran Russian soldiers down to enduring war-related chronic poor mental health issues.
It says post-traumatic stress disorder (PTSD) and battlefield desensitisation to violence are also likely contributors.
https://news.sky.com/story/ukraine-war-russia-news-putin-nuclear-live-updates-kyiv-12541713
* they'll problem release him to fight in Ukraine again
