https://www.hrw.org/news/2014/07/24/ukraine-unguided-rockets-killing-civilians
Interesting that at the time...2014...these "Russian Military" you speak of, are simply called "insurgents".
https://www.hrw.org/news/2014/10/20/ukraine-widespread-use-cluster-munitions
Another speaking of "pro-Russian rebels" .
In both cases, its the Ukrainians accused of using missiles and cluster bombs in urban areas.