US citizen who relocated to Finland ~4 years ago here!
>[D]o you think the current economic difficulties are structural or just a temporary consequence of war?
Definitely structural, but I am far from an expert, caveat emptor. The high unemployment rate even for highly educated workers in a country with such excellent English proficiency (== access to worldwide capital markets) is my main indicator. I really do think the heavy taxation structures at most levels of society here is driving out entrepreneurship in droves. This isn't the conclusion I was most hoping to reach before moving here; there's a world in which a robust safety net, paid for by such taxes, actually incentivizes entrepreneurship by cushioning the fall - but I just don't see the evidence for us living in that world, at least not here.
The good news is that that means Finland's current problems are largely self-imposed. Lightening up this tax regime for a few decades will probably lead to an economic miracle for the country. Finland has many other factors in its favor and I'd love to see that happen. (I probably won't stick around for it, simply because I'm starting to get sick of working 50,000€ jobs that currently pay >$150,000 in the US. But a few decades of above average economic growth can work wonders, if the country decides to go in that direction, and I may well end up coming back for my twilight years.)
>Are you concerned by the geopolitical situation, with an aggressive neighbor possibly escalating sometime in the mid term?
Not at the moment, but that's very much because of NATO. The war actually broke out just a few months after I moved here, and the period between then and the NATO acceptance was probably the most terrified I have ever been in my life.
War hits different when the aggressor actually shares a border with you. I don't think I realized quite how lucky the US was in that regard geographically until it actually happened. I had nightmares quite regularly during that time and it became a daily topic of conversation in my house with my then-fiancee, now-wife as to whether we should cut our losses now and move to the US, instead of waiting an unknown amount of time for my Irish passport to be granted to me.
If NATO dissolves we are packing our bags and getting on the next flight to Boston, or at least Oslo or Dublin or something. That's not really "Finland's fault", of course, if anything Finnish-Russian diplomacy has been the eighth wonder of the modern world for the past 70 years or so.