It’s macroeconomic basics: government is spending a lot, domestic demand increases and doesn’t match the supply, which cannot be balanced by imports (which would require spending of foreign reserves). The economy is gradually overheating, inflation is rising, so the central bank attempts to control it, because its only target is the inflation. That’s as simple as that.

2. Some manufacturing sectors of Russian economy do have problems, which do not hinder manufacturing capacity today but will have more long term effects. Chances are high that this will simply help China to become more competitive at the cost of Western producers of manufacturing equipment and electronics. They do not want confrontation with the West, but will use any opportunity to replace Western companies. Civilian aircraft production is going to be even more localized without the Western engines and may gradually catch up with the demand.

3. Sanctions on oil and gas trade simply do not work and are bigger pain for Europe than for Russia. You cannot cut off major supplier of hydrocarbons without full support of all the biggest consumers. It still goes on, just in other currencies (which may have negative long term impact on use of USD in international trade). Yes, Russian producers do suffer, but nothing really bad is going to happen to them.

4. Unofficial "Cancel culture" sanctions (Western brands pulling off Russia) have negative effect mostly on the Western businesses which may have lost one of their biggest customers, like some German companies. The assets are simply being taken over and they continue to contribute to Russian economy (and paying taxes) after some delay, switching to Chinese supply chain (e.g. car production). At best they will be paying double or triple price to return to the market later, at worst they will get more competition. It will be interesting though to see, how competition in digital services will evolve. For example, YouTube cannot be replaced by anything even when it does not sell ads or premium accounts in Russia.

To summarize, sanctions did not work. They did not and could not stop the war. The most damage Russia has inflicted on itself: excessive military spending increased inflation, from which civil servants and pensioners are going to suffer the most. Attempt to control it is going to result in major recession soon. Besides, massive emigration wave has put a lot of pressure on the job market and immigration from Central Asia can no longer mitigate it, because the attempt to recruit more soldiers from immigrants has scared many of them.

I still believe that the best strategy for the West should have been avoidance and deescalation, and then, when all opportunities were missed and the war started, US and UK should have deployed their military in Ukraine honoring the spirit of Budapest agreements. It was not wise for Ukrainian leadership to choose a side and push for NATO membership, but it was stupid for USA to leave the doors open, promise things that led to more escalation and then let the country slowly burn. This war is a major failure of Western diplomacy and lack of adequate strategy in Eastern Europe.

Well it's pretty clear the sanctions were never intended, by themselves, to stop the war. But it's not like the Western nations really had any other choice.

Fundamentally, sanctions are more about framing -- making it clear to Russia's regime that it simply won't be possible to continue doing "business with usual" with the West after it crossed the line that did.

I agree with you that Western pre-war policy was largely a failure, and certain things should have been done differently. But now that Russia's regime took the action that it did --- it must be opposed, and in any case not simply "greenlighted". Which a refusal to impose sanctions (or substantially help Ukraine in its defense) would have amounted to.