Most important assets are. Valuable assets like real estate and sometimes cars is mostly denominated in USD and sometimes EUR, as the Rubble is too weak and volatile for the general population to bother with it for valuable assets. It's the same in Romania, cars and real estate are denominated in EUR despite nearly everyone in the country being paid in the national currency RON, and, before the creation of the EUR, they were denominated in USD or Deutsch Marks as the national currency was fluctuating like BTC.

>The ruble losing X against USD doesn’t automatically mean that everything becomes higher priced by X immediately (except for imported goods)

It does, since Russia doesn't really manufacture any high value goods that are in demand on the free market, so it has to import nearly everything apart from basic food, fuels and raw materials.

I'm sure Russia can survive just fine without Dutch cheese, US bourbon, Italian designer clothes and French wine imports due to sanctions, but US CPUs, GPUs, iPhones and MacBooks, German car parts and industrial equipment, Swedish trucks, Liechtensteinian dental drills, French Airbuses and Japanese cameras, industrial robots, cutting edge sensors and chips still cost the same amount in USD, EUR and YEN to make but now 2x the price in RUB to import due to the devaluation and Russia needs to import all those things to not go back to the stone age, as they don't manufacture any equivalent domestic alternatives.