It is the "distributedness". People like to split the world into clean zones: here is war, after this border, no more war. After all, the risk gradient jumps extremely when you cross the border from Poland into Ukraine.
An attack like this a) reveals that some people aren't what they perhaps pretended to be, e.g. civilians, b) shows that war can reach with very long fingers into places that considered themselves relatively safe.
It is the "distributedness". People like to split the world into clean zones: here is war, after this border, no more war. After all, the risk gradient jumps extremely when you cross the border from Poland into Ukraine.
An attack like this a) reveals that some people aren't what they perhaps pretended to be, e.g. civilians, b) shows that war can reach with very long fingers into places that considered themselves relatively safe.