Fire at sea is about the worst thing any vessel can face, particularly a capital warship. I hope that the human toll is kept to a minimum, and that the sailors return to their home port soon.
That said, the Kuznetsov has a demonstrated record of being a real garbage scow. I'm not especially in favor of a return to the Soviet days of navies from the East roaming far and wide, but I don't really relish Russia losing an imprtant asset. We never know when we might find ourselves fighting a common enemy. Like Switzerland. I still say the neutrality bit is a ploy. We must stand ready to face the Swiss navy!