It is a double-edged sword. The short impact, depending on an industry, is that the Russian government will have slightly less money. This is net good short term because this money finances the war among others (but also education, hospitals...). However, in the long term, this means increasing the divide between the two worlds and, economically, the Russian government trying to reproduce the missing markets locally and partly succeeding, at least for non-hi-tech sectors.

What would I call the most important front of this war? A call to ordinary Russians. Explaining to them how wrong is this war. That Putin has been lying to them for decades. There were no Ukrainian Nazis who were persecuting the Russian population in 2014. Russia wasn't forced to start the war. NATO doesn't "expand" as a self-conscious organism or by the will of the USA (heck, Trump would even happily back out of it!) - on the contrary, individual countries join it so that they don't share the fate of Ukraine. If all Russians understand what happened and Putin has no support, there will be less reason to continue this inhuman activity, also by his successors. But if Russian themselves are supporting the war, there is no hope of stopping it.