A WSJ correspondent notes "Taiwan's Foreign Ministry is hosting a live stream of a welcoming ceremony for a very special, albeit unnamed, guest at Taipei Songshan Airport." Meanwhile, regional reporting says a Chinese People's Liberation Army (PLA) Air Force Su-35 fighter jet(s) is crossing the Taiwan Straight.

Update(10:17ET): Bloomberg is reporting China has closed airspace above the Taiwan Strait to all civilian aircraft. 

CIVIL DEFENSE WARNING SIRENS TURNED ON IN CHINA