Thing is - there's no need to break the Russian civilian resolve, because nobody has the goal of invading and occupying Russia. It just needs to become far too painful for Russia to continue on its present course of action.

Let's say theoretically that Ukraine successfully takes 90% of Russia's oil refineries out of action and this crashes the domestic petrol/diesel supply so thoroughly that plowing, seeding and harvesting with mechanized agriculture equipment also crashes in Russia. Or there is a breakdown of cold chain transport warehousing/trucking and grocery supply due to lack of diesel fuel for all of the trucking. Could it result in a collapse of the russian state and civil war? Very possibly.