The United Arab Emirates and the United States are facing a “stress test” in their relationship, a senior Emirati diplomat said on Thursday, as Russia’s invasion of Ukraine strains ties. Yousef al-Otaiba, the Emirati ambassador to the US, was speaking days after the UAE abstained in a UN Security Council vote on a resolution demanding a Russian withdrawal from Ukraine. “Our relationship with the US is like any relationship,” he told the International Defence Industry, Technology and Security Conference in Abu Dhabi. “It has strong days where the relationship is very healthy, and days where the…