If investors weren’t concerned enough about the fate of U.S.-China trade, the arrest of Meng Wanzhou on Dec. 8 and new reports that Chinese state-sanctioned hackers were behind a massive Marriott data breach have ramped up those worries.

As President Donald Trump and Chinese President Xi Jinping hammered out a truce in the two countries’ trade conflict at the G20 summit, Meng, the chief financial officer of Chinese technology giant Huawei, was arrested in Canada for allegedly violating U.S. trade sanctions against Iran.