I've read and seen analysis about why the sanctions against Russia have thus far failed spectacularly.

One of the stats pulled out in those early Western statements about why Russia would fail so quickly is that Russia's GDP is the same size as [fill in the blank of smaller EU country].

If you subtract the portion of US GDP from Health Care (as you mentioned), insurance (partially part of the health care number), entertainment and the finance (23% of the US GDP?), then the US GDP gets much smaller (I don't remember exactly off the top of my head and don't have tim to look right now) than the official number.

Then if you look at the other side of the equation and note that Russia produces energy (gas and oil) food and fertilizer in a relatively tight market (plus other industrial goods), the Russian GDP number is much larger than the official number.

So as you say, when shit hits the fan Russia's customers for gas and oil "find a way" to buy, which in turn allows Russia to "find a way" to get components they don't (yet) produce at home, while Germany finds that without cheap Russian gas, their finished products just become more expensive than their competitors'.