if western Russia, the Russian embargo will stop supplying gas to western
And in 3 months Russians will starve to death as oil and gas make 60% of their economy.
90% of medicine comes from the west , 70% of cars come from the west. 90% of passengers planes come from the west.
Half of the drilling equipment comes from the Netherlands and Germany.
Do they eat medicine, cars and passenger planes (regarding your words that Russians will starve to death)? You also seem to be forgetting that Europe would be freezing but for Russian gas (and the winter is coming, yeah). So it cuts both ways, and you don't know which side would cut sharper and deeper...

Without selling gas and oil they will have no money to buy one loaf of bread

. Remember what happened at the last serious drop in oil prices? We said bye bye to the URSS
And you seem to be forgetting that only 24% of the total gas consumed by Europe comes from Russia.
Do you have a clue how much goes to the industry and how much to heating?
Besides , without equipment from Germany and Netherlands the russian can't even extract their own gas and oil

.