I cannot say if this is legitimate or fake, sent to me by a Ukraine source. If true it is alarming. My first clue is the Reuters logo on the video at the very beginning. A search of the Frankfurter Allgemeine Zeitung website did not reveal the below video.
The source, the Frankfurter Allgemeine Zeitung, is a legitimate news outlet. When I lived in Germany I read it almost every day.
Frankfurter Allgemeine Zeitung on how Russian occupants in Crimea are teaching children how to plant mines and use weapons