With which nation has Azerbaijan had a long-running dispute over its exclave of Nakhchivan?

Question

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Azerbaijan has had a long-running dispute with its neighbor Armenia over its exclave of Nakhchivan, which is located between Armenia and Iran. The dispute stems from the Nagorno-Karabakh conflict, which began in the late 1980s and early 1990s and has resulted in the displacement of over one million Azerbaijanis from their homes. The conflict is unresolved, and tensions between Azerbaijan and Armenia remain high.

With Which Nation Has Azerbaijan Had a Long-Running Dispute Over