By Samuel Shen and Andrew Galbraith SHANGHAI (Reuters) – The Moscow branch of a Chinese state bank has seen a surge in enquiries from Russian firms wanting to open new accounts, a person familiar with the matter said, as the country’s businesses struggle with international sanctions after its invasion of Ukraine. “Over the past few days, 200-300 companies have approached us, wanting to open new accounts,” the person, who works at the Moscow branch of a Chinese state bank and has direct knowledge of its operations, told Reuters. He declined to be named or have his bank identified as he is not a…