Yeah, waiting to see if the current iteration of PD-14 engine[0] is finally up to the task. Two years ago UAC tested them and found to be in the need of improvement.
[0] https://rostec.ru/media/news/rostekh-peredal-partiyu-seriyny...
[0] https://rostec.ru/media/news/rostekh-peredal-partiyu-seriyny...
If the Russians manage to do this, it would be another example of the stupidity of the sanctions.
I bet COMAC is cheering them on too.