Actually the VSTOL technology of the Russians are superior to
that of the US. So much so that even designers for the VSTOL F-35B
consulted the engineers working on the Yak-141. Reason being that
the Soviets come out with their own version of the VSTOL aircraft,
the Yak-38 Forger but the US got their Harriers from the British.
They also have been working on the supersonic VSTOL Yak-141 while
the rest of the west are still using the subsonic Harriers. The
Yak-141 is only prevented from turning operational due to funding.
Therefore it will be an unfair assumpstion that all Russian weapon
systems are inferior to their western counterparts.
After the show in Farnborough, Yakovlev design bureau worked
together with Lockheed on Joint Strike Fighter (JSF) programme. As
a result, Lockheeds final JSF proposal resembles... the
Yak-141M
http://www.bearcraft-online.com/museum/museum.htm?mid=89