[yyyk]

This fails the 'proportionality' test. Contrary to popular knowledge, it does not refer to number of civilians killed*, but to whether any legal goal could reasonably be achieved proportionate to the hurt.

Now, there's nothing this action could achieve aside from making people angry, becoming Russian propaganda-fodder, reducing trust in NPM, etc, in any remotely likely scenario. So any damage is a crime, and arguably even the possibility of damage is a crime.

* A strike on head of ISIS while being surrounded with a class of children might pass this test. Similarly even if one side (say ISIS supporters) has more civilians killed that does not imply a crime by itself.