China told Washington this weekend that Xi Jinping's September 24 visit to the White House is conditional on the United States not approving a pending Taiwan arms sale, according to the Taipei Times. The Ministry of Foreign Affairs, under Wang Yi since 2013, delivered the warning as the arms package moved through the same congressional notification process that has cleared Taiwan sales under four US administrations without previously being framed as a summit trigger. Beijing did not ask Washington to cancel the sale outright. It asked for delay past September 24, which converts an arms transfer into a scheduling problem the White House controls and China does not.

That distinction matters because a summit is a date on a calendar and an arms sale is a signature on a notification, and only one of those two things is reversible on short notice. Xi's National Security Commission, the body he has run since 2014 and pared to two members last month, has no vote on US export licensing. What it has is a visit it can walk away from, and walking away from a visit costs Beijing nothing it did not already have. If the sale clears before September 24, the summit becomes the casualty, and Washington will have learned that Taiwan procurement, not the visit itself, is what Beijing was always negotiating.