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The page says absolutely nothing about the realtionship between Uzbekistan and Turkmenistan other than the fact that the 2 nations have embassies in each other's capitals.
"Uzbekistan–Turkmenistan relations refers to the relations between the Republic of Uzbekistan and Turkmenistan. Uzbekistan has an embassy in Ashgabat.[1] Turkemnistan has an embassy in Tashkent.[2]"