Sanctions take time to bite. A lot of their infrastructure and industry uses western technology. They can no longet get that technology like spare parts, the people to operate on it etc (I think their oil drilling and pumling is based on western designs) When things break (and they will break, everything eventually does) they can't fix/replace it without overhauling the entire system, which will either force them to take IOU's to China, or just go without. The average consumer in Russia has also lost a lot of opportunity and products on the shelf. Russia also no longer trades, their currency looks great on the outside but the second they reopen to trade, that would drop quicker than concrete in the ocean.