I'm guessing at this point it's dominate Ukraine at any means necessary and ride out sanctions until they start to slacken after countries like Germany, etc need gas and are willing to accept that Ukraine is an extinct country to get it.

And, unfortunately, that just may be what happens. A lot of countries are too lazy with investing in renewables or nuclear and they're in for some very hard times if they need to rely on gas to be shipped in or piped around Ukraine/Russia, so I can imagine sanctions being loosened in under a year for many countries. At least France was smart enough to go for nuclear and can probably hold a moral high ground as long as they want and the US has shown they'll hold grudges for decades (see Cuba and Iran).