Copper rose for a third day — supported by a weaker dollar — with traders weighing the impact of the US-China trade war as mainland markets reopened following the Lunar New Year break.

Beijing imposed retaliatory tariffs on a range of US products on Tuesday and announced an investigation into Google, moments after US President Donald Trump imposed a 10% levy on Chinese imports. China put export controls on several niche metals — most notably tungsten — but didn’t impose any duties on copper imports. A weaker US currency is making commodities cheaper for most buyers.