Azor....there is an interesting way to estimate Russian deaths inside eastern Ukraine but it takes a lot of research but the info is there....

Collating 2016 #OSCE data. Why are Russian Ministry of Emergency Situations trucks crossing border? Carrying bodies?
http://www.osce.org/om/255341

Plus the OSCE reported Russian trucks spotted carrying the 200 symbol for KIAs...

This though does not count those buried inside eastern Ukraine in largely unmarked graves...who usually are locals...