Although US astronauts are able to launch from Florida, some American astronauts still launch aboard Soyuz. Tracy Caldwell Dyson, an American, is aboard the ISS as of this writing, arriving after a liftoff from Kazakhstan on Soyuz MS-25. NASA and Roscosmos recently reached an agreement for a ride share, allowing one open seat for astronauts on Soyuz, and in turn one seat on American commercial crew vehicles for cosmonauts.
The next crew mission to the International Space Station is set to fly aboard a SpaceX Crew Dragon capsule, and in addition to three NASA astronauts that will be onboard, the fourth seat will go to cosmonaut Aleksandr Gorbunov. The integration of these crews could cause for training problems.
Gorbunov spoke with NSF with the assistance of an interpreter about his upcoming flight and training and noting what it takes for a cosmonaut to train to fly with astronauts.