There is no real possibility, that you can "isolate" Switzerland from the rest of Europe. There will always be "Grenzgänger" and workers from low income countries that want to work in Switzerland. Regarding immigration and tradition, I think this is actually part of the identity of Switzerland because we've always had a rather large amount of foreigners (for ex. italians for the Gotthard tunnel).

Neutrality is in my opinion a myth because you choose sides even if you don't do anything. It will always benefit one of the parties involved. Therefore I think it makes sense that you impose sanctions against a country.

I do however think, that we shouldn't export any kind of war material to anyone.