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2. Sergey Karelin — Eternal War (Contemporary Russian Fantasy)

: Dictators, tyrants, and great rulers from Earth's past are brought back to life in a strange new world. They must decide whether to repeat the mistakes of history or find a new path while facing a modern threat: the "Player". Key Installments : Eternal War — 1 Eternal War — 3: The Reverse Side of History

This is a seminal 1974 novel inspired by the author's combat experience in the Vietnam War.

:If you want a deep, thought-provoking story about the human cost of conflict, go with Joe Haldeman . If you prefer a "useful" exploration of leadership and historical "what-ifs," Sergey Karelin's series is the better fit.