Dollar holds advantage as Hong Kong tensions test risk-wary investors

TOKYO (Reuters) - The dollar edged higher against most Asian units on Monday as worries about a standoff between the United States and China over civil liberties in Hong Kong fuelled demand for safe-haven currencies.The yuan and Australian and New Zealand dollars fell as risk-aversion hit foreign exchange markets.Sterling was on the defensive after members of British Prime Minister Boris Johnson's party called for the resignation of an influential aide for breaking travel restrictions during the..