In a brief statement, the UK government said it had not been able to add its name to it because of concerns about national security and “global governance.”

https://www.bbc.co.uk/news/articles/c8edn0n58gwo

No idea if thats a real reason or not.

You’re right, I’ll edit a corrrection

Not to disrespect the amazing achievements of the Finn’s in that war, but they lost, and lost half their country. (Edit: 10%, not half. Sorry Finland.)

Incredible job not to lose the whole thing ofc.