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Vulcans are members of the United Federation of Planets, which has been in various states of diplomatic relations with the Klingon Empire over the years. Most "recently", the Federation and the Klingons resumed their alliance in order to fight the Dominion War, as shown on Star Trek: Deep Space Nine. So, as of the late 24th Century, the Federation and the Klingons are allies, which means the Vulcans, as a Federation member world are allies of the Klingons.

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