Is there another public source for encyclopedia-type articles that is better for geopolitical content? For example, if I have a philosophy question I'll often consult the Stanford Encyclopedia of Philosophy instead of Wikipedia.

If there isn't a more neutral public source -- if there are only sources with different biases, or if the better sources are behind paywalls -- then I think that Wikipedia is still doing pretty well even for contentious geopolitical topics.

Usually disputes are visible on the Talk page, regardless of whatever viewpoint may prevail in the main article. It can also be useful to jump back to years-old revisions of articles, if there are recent world events that put the subject of the article in the news.

Apart from Wikipedia, speaking more generally, I think that articles with a strong editorial bias still provide useful information to an alert reader. I can read articles from Mother Jones, Newsmax, Russia Today, the BBC, Times of India, etc. and find different political and/or geopolitical slants to what is written about and how it is reported. I can also learn a lot even when I strongly disagree with the narrative thrust of what is reported. The key thing is to take any particular article or publication as only circumstantial evidence for an underlying reality, and to avoid falling into complacency even when (or especially when) the information you're reading aligns with what you already believe to be true.