Where are these alternative pipelines going to come from? Syria was about that and they failed to overthrow the regime despite the horrific damage it caused. Sweden and Finland in NATO isn't really going to change that much, though it remains to be seen if either will pull that trigger, especially Finland.
NATO bases in Poland or the Baltics? LOL! Fuck no, no one is going to spend that kind of money. Germany will spend more to prop up their economy, but that's about it. The US cannot afford it and Germany is not going to build up enough to deploy forces east of their own country. France and Britain might make a show of things, but aren't going to build bases. Face it the west is impotent.
Muslim guerrillas are willing to sacrifice, reports are now that people in Ukrainian cities are bitching that the power is turned off. The arming of civilians is not going well either. Turns out you need a population capable of massive sacrifice and the skills to succeed to actually pull that off, which only the neo-Nazis in Ukraine actually had, but they are caught up in the east of the country.
FWIW, I have previously read about Algeria as an alternative natural gas source for Europe. Algeria should be willing to play ball here since it would mean less Western pressure in regards to things like democracy, the Hirak movement, et cetera.
I'll have to read up on power in Ukrainian cities being cut off. Of course, there is always the Molotov cocktail option.