BBC News By Gordon Corera image copyrightAFP via Getty Images Internal documents from HSBC bank have been released as part of a lengthy extradition battle over the Chief Financial Officer for Chinese telecoms giant Huawei. Lawyers for Meng Wanzhou are fighting to prevent her extradition from Canada to the US for alleged sanctions breach. They argue the bank documents undermine the US case. Her 2018 arrest in Vancouver sparked a major international row, corroding diplomatic relations. The case is particularly sensitive as Huawei has become a lightning-rod for US-China tensions and competition over technology, and besides serving as CFO, Ms Meng is also the daughter of its founder, a former Chinese army engineer.