Engines: MC-21 flew with a locally built PD-14 engine in 2020 (wikipedia). Work is underway on SSJ-New with a local PD-8 or a PD-14. There was a snag with composites, which were sanctioned by US a few years ago because of some other random bullshit, but now they are built locally as well.

> other critical components

Like what? This sounds a bit hand-wavy, what are those critical components, if you don't mind me asking?