This was just a shot across the bow of the ship America by Red China.
The CCP is giving the US a hint of what will happen all over our US if the US government and military try to stop China on the day the CCP military invades Tiawan.
Our government, federal, state and local have to improve the cyber defenses. So do all our companies running our essential services. Do this now our suffer later.
Out reply could be to cause the three gorges dam to spring a leak.