I think this is why it's so important to figure out a path to returning Königsberg to western control before the war runs its course. If we assume that Russia is basically disassembled and parted out, it's looking increasingly certain that China ends up in either nominal or practical control of almost all of those parts. For the most part this seems inevitable at this point, but there still seems to be a path to keep Königsberg as a western region; and an optimistic can imagine keeping St. Petersburg as well, but I don't see a path for forward action on that before Russia's collapse, and I don't really see how the west can act faster than China once the collapse begins.