I just finished this one so it might just be fresh in my memory, but I really enjoyed Kiril Yeskov's "The Last Ringbearer". It's a sequel/retelling of Tolkien's "Lord of the Rings" written from the Mordorian perspective and based on the premise that LOTR is "a history written by the victors".

It has a completely different feel than Tolkien's writing, and sort of stuffs something resembling Cold War politics into Middle Earth. It's obsurd, but somehow makes perfect sense.

I originally saw it recommended on hn, so thank you whoever you were!