Although both are apex predators, their prey and environments are very different. There is no evidence of Siberian tigers and polar bears ever encountering each other, let alone fighting or one eating the other.
Do Siberian tigers eat polar bears?
No, Siberian tigers and polar bears do not live in the same habitats and therefore do not encounter each other in the wild. Siberian tigers live in the forests of Siberia, while polar bears live in the Arctic regions.