GLOBAL MARKETS-Ukraine tensions, Chinese data sour sentiment

By Catherine EvansLONDON, May 5 (Reuters) - European stocks slipped in thin trade on Monday after soft Chinese manufacturing data, while simmering tensions in Ukraine underpinned safe-haven government bonds and gold.Portuguese bond yields edged to eight-year lows after Lisbon said on Sunday the country would make a clean exit from its bailout later this month.Volumes were thinned by the closure of