not unexpected since lockheed and a Russian company basically designed the f35 concept together with preexisting Russian vtol technology, forgot that
planes name but the f35 looks a lot like it from what i remember.
Only the lift fan was taken from the Yak-141. The only design work done with them was working out the lift fan. The Yak-141 and F-35 don't look much
alike beyond the lift fan.
As for this design, I've said it for years, form follows function. There are only so many ways to build aircraft.