Beijing told Tokyo, not Washington, that it would cancel a planned leaders' summit with President Trump if the United States approves new arms sales to Taiwan, according to Japanese media sourcing reported by the Taipei Times on September 12. A cancellation threat delivered through a third country's press corps is not a warning aimed at changing Washington's mind before the sale. It is a record built for the moment the sale goes through anyway, so Beijing can point to a threat it made and kept. The choice of channel matters as much as the threat: a message meant to stop a policy goes to the people who set the policy. A message meant to survive the policy goes to whoever will keep repeating it.

This lands three days after China reinforced artillery positions along the Taiwan Strait, the desk's last sourced move there on September 11. A summit threat and an artillery reinforcement are not two separate signals about the same dispute. They are one position stated twice, once in the register of diplomacy and once in the register of hardware, so that whichever channel Washington is watching, it gets the same message. If the arms sale proceeds and Beijing walks back the cancellation threat, the summit was never the stake. Taiwan's arms pipeline was, and Beijing has just told Washington what it will spend to slow it.