Then clear this doubt for me.
(...)The Russian Federation has approved the final PAK FA design, this remains secret but we will have to wait till late 2007.
(...)
The Novosibirsk Chkalov Aviation Production Association (NAPO) has begun construction of the fifth generation multirole fighter.(...)
From the article I linked in wikipedia.
What does this mean exactly? Construction = development? Final design = draft?
They construct a working "final" prototype. It will then fly. This is called the maiden flight of the plane. It's either A) oh it works quite well nothing dramatical or more likely B) ....
**** return to drawing boards pronto. Usually.
Then the small problems are cleared and finally, after months and years, the production version is roughly ready (yes there will be more flights here and there but they're not very dramatical).
And then the real production starts. And then all the small errors and faults are fixed.
PAK-FA, whatever it's designation is, Su-XX, is not a ready product. Far from it. 4th and 5th generation fighters take usually more than 15 years to put into use, and that's with a lot of spending guaranteened for every year. Even Russia's own plans differ - in 2002, they said that they would have the ready PAK-FA in 9 years (insanity)! So I have no idea how anyone can say that because PAK-FA's working prototype is scheluded to fly next year, it means it's in production now. It does not work that way!
Also suspicious to those familiar with Russian arms sales is the silence around this plane. Su-35BM, "The Last Flanker", which is considered to be last Flanker variant before PAK-FA (which doesn't really have a name yet, except T-50), is heavily advertised, meaning Su-35BM is much closer to ready product than the secretive pakfa (unless Russia is not even aiming at export markets, something I do not simply believe). This, of course, does not prove anything.