Came across a video on Rumble, which of course doesn't provide any sauce, but doing a quick Bing search provides one matching result which of course is the top result and appears to be by a "fact checker"
Eye's on, something may be breaking on Antarctica...
https://rumble.com/v1k7pod-russia-claims-to-pull-out-of-the-antarctic-treaty.html
I provided sauce, an article discrediting it. That in itself is sauce, sauce doesn't have to support a story, refuting a story is sauce as well.
I think I can speak for the majority here when I say that anything being "fact checked" is a good indication it is in fact, fact.