Hong Kong stocks slumped to a two-month low as Chinese Big Tech led losses while global markets sank and safe haven assets surged after Russia attacked Ukraine. Concerns about weaker corporate earnings also hurt sentiment. The Hang Seng Index retreated 3.2 per cent to 22,901.56 at the close of Thursday trading, the steepest drop since September. This week’s losses amounted to US$104 billion of market value through Wednesday. The Tech Index sank 4.3 per cent, while the Shanghai Composite Index lost 1.7 per cent. Alibaba Group Holding, the owner of this newspaper, tanked 6.7 per cent to a record-low HK$104.90…