SHANGHAI/HONG KONG (Reuters) -China's stocks and currency came under pressure as markets returning from a week-long break were greeted by a new trade dispute with the United States and ructions in the global artificial intelligence sector. Tariffs so far have been less than what the Trump administration had initially indicated and relief was evident in Hong Kong, where Chinese stocks rallied this week. Meanwhile, enthusiasm around China's artificial intelligence company DeepSeek bolstered AI stocks.