Interesting that the Tu-144LL was fitted with the Tu-160 bombers engines. https://en.wikipedia.org/wiki/Kuznetsov_NK-32 ; The Tu-144LL did test flights for Nasa and Boeing, when they tried to design a supersonic jet liner https://en.wikipedia.org/wiki/Tupolev_Tu-144#Use_by_NASA ; at least someone was trying to learn from the design of this bird.