What is meant by the phrase "to remember that, in the past,
those who foolishly sought power by riding the back of the
tiger ended up inside"?

This was part of JFK's inaugural speech referring to communist countries. What it is saying is that the tiger will let you ride it, but when it gets hungry, it will eat you, thus the "end up inside" part

Explanation:

“the battle of stalingrad is not a turning point necessarily in strategic terms, because a lot more has to be done before the soviets can be certain of defeating germany,” says renowned world war ii historian richard overy. the germans had fought nearly a thousand miles across the soviet union to get to stalingrad.

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