These people are totally dumb. They think Russia needs them paying euros or dollars. No, Russia needs some imports, the currency is used so they can get these imports. They used to get their imports from mostly Europe. In a lot of cases Russia still bought from Europe due to inertia, today South Korea or China have better or more cost effective products. Also Europe and the main population cores of Russia are closer geographically. That was part of the reason of them having more trade. So the Russians wanted euros as payment for their exports to do those imports. But if Europe does not want to sell Russia anything of consequence, there is little Europe makes that cannot be purchased from China instead. In which case the Russians just need to pay China with something they want. Since Russia has a positive trade balance with China there simply is no problem at all. It is just a matter of setting up proper payment channels.
Russia's oil, gas, and coal are also basically the same distance to China as they are to Europe. See where the Yamal peninsula or the Kuzbass regions are. Draw lines to Berlin and Beijing. So switching to a different destination of sale will cost about the same for exports once the trade routes adjust and more transport capacity is built. Russia's main issue then is those imports from China which have to traverse longer distances to reach Russia's population cores. Costs will increase due to distance. But Chinese goods are typically cheaper than European ones so it will probably be a wash or maybe even cheaper.
In the meantime Europe lost not just imports of Russian energy, minerals, and other natural resources, they also lost exports to Russia. Before 2014 Russia imported most of its food from Europe. Today they either produce it themselves or import it from Central Asia. And they bought high value added products like airplanes and cars. Which they could have made themselves albeit with lower quality. They also bought medicine, which now has to come from India and China. I bet some leaders in Europe looked at trade between Russia and the EU plus the EU and the US and thought it was no big deal cutting Russia out. Well now the US wants Europe not just to cut Russian trade, but also Chinese trade. Good luck with that. It is no wonder their economy is imploding.