A-riddle-wrapped-up-in-an-enigma meaning

(idiomatic) Something very mysterious and hidden.
noun
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Origin of a-riddle-wrapped-up-in-an-enigma

  • "I cannot forecast to you the action of Russia. It is a riddle, wrapped in a mystery, inside an enigma; but perhaps there is a key. That key is Russian national interest."

    From Wiktionary