<ul><li>US President Donald Trump had a tense exchange with Ukrainian President Volodymyr Zelenskyy during their meeting in the Oval Office.</li><li>Negotiation and conflict-resolution experts analyzed the clash and criticized Trump's approach.</li><li>Experts questioned Trump's ultimatum and its impact on US commitment and relations with Russia.</li><li>Zelenskyy left Washington without signing the deal, and his departure was unexpected.</li></ul>

The art of no deal: Negotiation experts dissect Trump and Zelenskyy's Oval Office clash

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