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Astronauts are now stuck on International Space Station indefinitely due to issue with Boeing Starliner
(www.independent.co.uk)
Also docked to the space station is SpaceX’s Crew Dragon capsule that ferried four astronauts to the ISS in March, and a Russian Soyuz capsule that delivered three others in September. Stich acknowledged that at least one of those vehicles could provide an alternative ride home for Wilmore and Williams.
NASA Administrator is a high-prestige, high-profile political appointment. The Administrator answers only to the US President. There is never going to be a situation in the current political climate where a sitting President (regardless of party) asks for Russian help when there's another American company that's already successfully doing passenger taxi service to the ISS.
That puts the Roscosmos Administrator in an interesting political situation. There's probably going to be an internal political argument about how to respond. They could cheekily offer a certain-to-be-rejected offer of a rescue flight, but would be a domestic propaganda win. Or they could keep it professional with some variation of "We have trust in our skilled partners at NASA to resolve the situation".
I'd bet the latter wins out though. Roscosmos (and its predecessor organization in the USSR) and NASA have always kept a friendly and professional relationship, regardless of geoplitical tensions. The predecessor to the current Roscosmos Administrator was known for running his mouth off but the current one is a lot more professional and diplomatic.