Until they are replaced they will not get updates, leaving them open for possible intrusions. Let them have Chinese equipment, starving them of western technology to reverse engineer, steal or sell to competitors isn’t a bad thing either.
Probably, but will they be able to reverse engineer and produce successfully?
Everything I've read about Russia indicates that, while they have plenty of smart engineers*, the business culture and civic society are so messed up that they have lots of problems actually making things in practice. Too much corruption and people trying to take advantage of each other.
* Well, maybe less now, since so many IT workers fled