Given that this is related to terrorism[1] I'm pretty sure a creative government could find a way to attempt penal prosecution here if they really wanted though (After the terror attacks in France in 2015-2016, French law made “terrorism apologism” a crime for instance, which is a scary law tbh, especially when we've seen how it was applied).

[1] I personally don't like to talk about the Hama's massacre as “terrorism”, as an organized military crossing a border to systematically eradicate civilian population is much more than terrorism: it is genocidal in essence.