Xerox.
It's actually a very interesting and deep thing - the soviet copying! As i've learned from memoirs, the main goal never about copying a thing, but to adopt the technology behind it. When Tupolev bureau copied B-29 the most impact was to means of soviet industry - new materials, new tools, new production processes. So DNA of Boeing lives through most of soviet post-war aircrafts, but sometimes in a way one's less expecting.
In the result, the Tu-154 has nothing in common with B-727 except layout and some legacy instruments on a pilot's panels. Tu-144 and Concorde are far more different, than B-737 and A320.
Same thing was with soviet cars, domestic appliances and electronics. The body design seems to be 1:1 copy, but inside - a totally different design, adapted to means of soviet industry and availability of domestic electronic components. The most soviet "copies" of early Intel MCU's was a complete new design with same ISA as origin. Like the AMD and Intel x86 MCU's now, but without licensing.
Some things soviets were happy to just xerox, but since the means of production were very different - they just can't. So they re-invented this things anew, with a compatibility with original product.