China's expanding AI ecosystem and easing U.S.-China tensions are reviving the case for Chinese equities, in particular the technology sector, according to UBS. Suresh Tantia, head chief investment officer of Asia equity strategy at UBS Global Wealth Management, told CNBC's " Squawk Box Asia " that easing tensions between Washington and Beijing after last week's Trump-Xi summit should allow investors to refocus on market fundamentals rather than geopolitical escalation risks. "It seems like both countries are following the policy of live and let live, and that's not bad news from a market perspective, because markets can go back to fundamentals,"…