5 Russian GRU Officers, 1 Civilian Charged: Conspiring to Hack Ukrainian Gov't

> Five of the defendants were officers in Unit 29155 of the Russian Main Intelligence Directorate (GRU), a military intelligence agency of the General Staff of the Armed Forces.

Is it common to charge military employees?

I kinda assumed that if you went to war against another country after the war was over you couldn't say arrest a sniper for their kills. Like even during the war, you can capture people but you can't give them a life sentence for killing somebody no?