It will hurt only the EU the exports that 1. Are manufactured in EU and 2. In a way that requires large amounts of gas. For Russia, the loss of European sales

It will hurt only the EU the exports that 1. Are manufactured in EU and 2. In a way that requires large amounts of gas. For Russia, the loss of European sales will eventually be made up by East, sure - except they were selling gas to China below cost even before the war, and now, because they can no longer sell it to the West, they will have to lower the price even more. And at the end of the day, gas will be slowly phased out anyway, replaced by green energy, leaving Russia without any significant exports at all.