And no, they couldn't choose whether to buy tech from the US or China. China dealt with US companies. If Russia needed tech, they had to buy from American companies, who were reselling Chinese-produced products. By now being able to trade directly with China, they're bypassing the disgustingly high middle-man markup imposed by the US. It's a clear win.
If that's such a good deal, then why hadn't they been doing this all this time before the war...?
Um... How did the US become the hegemon? By having #1 military production, #1 military capacity, and the willingness to use it. After all the munitions we have given to Ukraine, we no longer meet operational readiness standards, and it's estimated it'll be anywhere from 3 to 5 years before the old cold war era production facilities are ramped up enough simply to replace what we've given away. Why you claim that heightened military capacity is not a "win" when they actively have a NATO-backed nation attacking them and EU nations are making noises at sending mass amounts of money and troops to Ukraine, I have no idea.
US has been and still is the global hegemon. The war in Ukraine changed nothing in this regard. Russia was barely able to capture some Ukraine territory and it took them 3 years to do this. And they wouldn't have done this if they weren't pushed to the wall, because they knew war would be costly.
I'm not certain what SWIFT numbers has to do with the strength of BRICS. SWIFT banned the majority of the largest Russian banks from transacting, and SWIFT was barely used at all for Russian currency in the first place. All that chart really shows is that the USD is crushing the EU.
Everybody on Earth wants access to USD markets. Russian's too. That's why dollar can be used as a weapon and is very effective at this. But, don't believe me. Straight from the horse's mouth:
https://x.com/MyLordBebo/status/1849061125414896076Even he'd prefer to still transact in USD, rather than scramble to develop alternatives.
I'd say the most major cost, given Russia has a history of not caring about the human cost, would be the blowing up of NS2. But even that isn't much of a cost to Russia. It's far more of a cost to Germany, who were looking forward to cheap LNG with no environmental impact and no transportation cost, and now no longer have that resource. So, cost for the EU, and Germany in particular. Russia will still sell their gas, and indeed are selling their LNG, to CHINA, via pipeline.
Yes, they will sell to China. But not at as high of a price as they could've charged when Europe was still competing for Russian gas. Cost for Europe will, of course, be great as well. And who will profit from this the most? US, selling expensive gas to Europeans.