The term used in the book discussed is collaborator, but I’m sure there are many who’ll argue either term is appropriate.

The commentators and politicians who’ve been giving support to Russia over Ukraine are a twist on the traditional collaborator, with so many at a safe distance from the reality of the conflict. They have to be driven by money or ego, given that self preservation isn’t an issue.

https://theconversation.com/what-leads-people-to-collaborate-with-the-enemy-ian-burumas-latest-history-considers-three-troubling-examples-207809