This is because of western sanctions. Chinese contributors are much more numerous and more important than any Russians ever were; and they're also not a sanctioned country, so I highly doubt it
EDIT: As an Iranian, however, there is not much time left before us Iranians in the FOSS world are going to be banned from everywhere, although some measure against us has already been taken (Microsoft banned the shit out of Iranians when they took over GitHub)
For example, one of the most widely used libraries in the world is written by an Iranian who works (worked?) at Google by the name of Behdad Espahbod (HarfBuzz glyph processor library)
Torvalds is a Finn. Finns are on a perpetual "pretending not to be a Nazi but actually being the reborn spirit of Goebells" mode, so it was a matter of time