This is a lot of US rhetoric designed to soothe bad-tempered, sulky Israel. Turkey doesn't receive $3b a year plus free war toys from the US. Nor does the US promise to veto any possible UN resolutions against it. So, why should Turkey have to "prove" anything to the US? It is mature, independent, and responsible. That's all the "proof" of honorable intentions anyone should need.
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from the article: U.S.: Turkey must prove its commitment to the West