London copper hovers at 2-year low.

London copper prices on Wednesday struggled to break away from a two-year low as markets remained fragile with barely any signs of progress in the year-long trade negotiations between the United States and China.

US President Donald Trump pledged to stand with American farmers in the face of Chinese retaliation, after Beijing halted US farm purchases and raised the possibility of additional tariffs on US farm products in response to new tariffs.

London copper rose as much as 0.7 percent in early Asian hours on...