I don't understand the need to bring laws into this. Laws are simply used by the powers that be as a excuse for their actions. They are free to be ignored when it becomes an inconvinience as long as the other side is unwilling to enforce the law in question.
Whether Russia responds kinetically to NATO ISR has nothing to do with legality and everything to do with balance of power. They don't want to give NATO an excuse to escalate so they leave their ISR alone, there's not much more to it.
Whether Russia responds kinetically to NATO ISR has nothing to do with legality and everything to do with balance of power. They don't want to give NATO an excuse to escalate so they leave their ISR alone, there's not much more to it.