On the contrary. We know Russian oxygen generators work less than necessary to sustain human life,
Russian oxygen candles have a high failure rate, the Russian SM is hazardous to occupants'
hearing, and Russian design engineers didn't meet the clearance specs for adding whatever is left to add to the ISS.
What a waste of time and money.
I hate to break it to you but the Russians are pretty good at building heavy lift boosters and they have shared their technology with us.