How did Ulysses Klaue get vibranium?

How did Ulysses Klaue get vibranium?

In 1992, Ulysses Klaue successfully stole billions of dollars worth of vibranium from Wakanda with the help of the Wakandan prince N’Jobu, which he sold until 2015, when his remaining cache was purchased by the homicidal A.I. known as Ultron.

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