S&P 500 futures: Falling as China to sanction US officials in response to Hong Kong,

Bloomberg is reporting that China is set to sanction US officials in response to Washington's move against Hong Kong's leader Carrie Lam.

-- more to come

A Chinese fighter jet has briefly crossed the median line of the Taiwan Strait, raising concerns in the island nation. The move is seemingly in response to the visit of US Health Secretary Alex Azar to Taipei.