Also I believe that Russia isn't being paid for astronauts to fly on Soyuz. Instead, cosmonauts fly on Dragon. It's a like-for-like exchange which is mutually beneficial (both countries need the other's cooperation to keep the ISS operational, so these exchanges ensure that can continue if either Soyuz or Dragon are grounded for some reason.)
Also I believe that Russia isn't being paid for astronauts to fly on Soyuz. Instead, cosmonauts fly on Dragon. It's a like-for-like exchange which is mutually beneficial (both countries need the other's cooperation to keep the ISS operational, so these exchanges ensure that can continue if either Soyuz or Dragon are grounded for some reason.)