I had the same thought, I even assumed there would be some international wartime law against it. But turns out it's apparently ok according to this study I foun

I had the same thought, I even assumed there would be some international wartime law against it. But turns out it's apparently ok according to this study I found from US Naval College > Conventional IHL (international humanitarian law), then, indicates that at least one form of disguising a military object as a civilian object—camouflage—is a permissible ruse of war, not a prohibited act of perfidy. Page 521 https://core.ac.uk/download/pdf/42550238.pdf https://core.ac.uk/download/pdf/42550238.pdf