From Ukraine last year, to Nagorno-Karabakh last month and now Israel, it really does feel like there's a trend of people becoming more comfortable with using large-scale unilateral violence to solve problems. That trend itself greatly worries me; each instance normalizes and legitimizes the next.

The problem is that bad players see that after any aggression i.e. Europe will condemn, in some cases impose sanctions and nothing significantly bad will happen, so why not invade and kill less powerful nations?

Unluckily what the big countries can do is to say we are sad and impose sanctions that are not significant.