Euro fell in European trade against dollar for the third straight session, marking week lows on risk aversion, amid mounting tensions between US and China on Hong Kong.
EUR/USD fell 0.2% to 1.0870, the lowest since May 18, after closing down 0.5% on Friday on profit-taking away from three-week high at 1.1008.
Euro rose 0.8% last week, the first weekly profit in three weeks on improving data for major sectors in May.
Gains were bolstered by a German and French proposal to found a 500 billion euro recovery fund for the most affected countries and sectors.
The dollar index rose 0.2% on Monday, the third profit in a row on haven demand.
Reuters said a White House source warned China of sanctions because of plans to impose strict security laws on Hong Kong.
Such sanctions would fray an already deteriorating relationship between the world's two largest economy due to the Covid 19 pandemic.