It's a country's leader petulantly ordering their entire country to call a lake by a new name that wrongly implies it belongs to them, which it doesn't, in order to spite their main trading partner because they rejected a trade deal that would massively harm them.

https://en.wikipedia.org/wiki/List_of_politically_motivated_...

Thanks for the link.

Going through those, it looks as if only about 50% stuck, mostly from World War II, so here's hoping. I'm not sure if using the name is in any way enforced?

[dead]