From 14 April 2014 to 31 December 2021, there were 3,404 civilian casualties and 7,000 injured civilians from Putin's forces operating in Ukraine. In addition, there were 4,400 Ukrainian forces killed with an estimated 39,000 injured. This is according to the Human Rights Commission at Ukraine.un.org.
Additional reporting from the commission is that there have been 1,006 civilian casualties as of 03 March 2022.
