METALS-London copper claws back lost ground on 'positive' Trump-Kim summit

(Recasts, adds Shanghai closing prices, updates London prices) BEIJING, June 12 (Reuters) - London copper shrugged off early losses to trade flat on Tuesday after U.S. President Donald Trump hailed a "very positive" summit with North Korea's Kim Jong Un, while Shanghai copper prices ended lower for the first time in eight days. U.S. President Donald Trump and North Korean leader Kim Jong Un pledged on Tuesday to work toward complete denuclearisation of the Korean peninsula while Wa