As an American, I would be more worried about China than Russia though. They makes a lot of our hardware and firmware, giving them plenty of chances to embed killswitches and zero-days. They have possibly the most successful industrial espionage program in the world, giving them the opportunity to find vulns in other systems and embed agents inside critical platforms. They have deeply internalized the concept of fighting where their enemy is weakest not where they are strongest, so they have likely invested in attacking the American military at home rather than on the field.
they did attack satcom systems to the point of bricking them.
what do you think would happen if you turn off critical infra for a country?
mass civilian death/suffering. military likely hardly affected but extremely motivated...
its counter productive.
So far, this has been only moderately successful in impacting the military, because most of Ukraine's military production is not actually located in Ukraine, and because they've gotten quite good at repairing their electrical grid.
This was generally true of allied strategic bombing campaigns in WWII as well. Simple adaptations like building walls between sections of the plant to require more bombs to attack any given target, hardened shelters for skilled employees, and staging parts outside of the plant enabled some targets to maintain better than 50% uptime during aggressive bombing campaigns. Look into the Oil campaign[1] for more details.
It is interesting to see how precision missiles and cheap drones may change this in the future.
1: https://en.wikipedia.org/wiki/Oil_campaign_of_World_War_II
