ZURICH (Reuters) -UBS’s first-quarter net profit rose 17% on Tuesday to its best since 2007 on the back of strong trading, upending expectations for a fall amidst uncertainties over the war in Ukraine. Net profit for the March quarter of $2.136 billion outpaced average expectations for $1.79 billion in a poll of 21 analysts compiled by the Swiss bank. One of the first two major European banks to report results alongside HSBC, UBS’s earnings provided a sharp contrast to the profit declines U.S. peers reported this month. “In the first quarter, we remained focused on executing our strategy, prov…