Do Ukraine and the West have a course of action in case of a total energy blackout in Ukraine right before the winter [1]? It seems to me that the local success in Kharkiv is not possible to expand onto other regions without significant army loss, because the adversary is energy-independent and is able to continue indefinitely as long as they don't lose their military or as long as their losses are xN fewer than Ukraine's. How much military did Ukraine lose to achieve success in Kharkiv region?

[1] https://www.theguardian.com/world/2022/sep/11/russian-strike...