Finnish military uniform. It’s not some Nazi uniform if that’s what you’re wondering. He was a Finnish soldier during Winter War where Soviet Union attacked Finland. People saying he was fighting for “Axis alignes Finland” are confusing Winter War for Continuation War where Finland fought alongside Nazi Germany against Soviet Union.

As for his personal opinions on Axis countries, I don’t really know. I don’t think he was very outspoken about those, if he had much of an opinion.