Even though Russian equip, like Su-37 and that latest MiG-1.42 are indeed manouverable and give a raging hard-on for everyone who sees them in air shows, they lack some other things needed for successful air combat: pilot training (ie. money) and radar techs.
Since most of the air battles are done with radar in mind and as countermeasures become more advanced, the importance of manouverability is quickly becoming a minor factor.
And as long as they lack sufficient funds to develop the techs, train the pilots and keep the planes up and running, the Russian tech is more important as import stuff (India) than as a valuable asset of their own defence forces.
Russian planes are tough, granted. They're manouverable, granted. They also have things like thrust vectoring implented on most of their new (though often existing only on the papers) planes. They form a formidable template for updating, like installing better radars, fly-by-wire systems and so on, and are a good match for F-15/F-16. But they still drag miles behind USAF, RAF etc., partially because all practical work with the projects ceased at early 1990s, and lately it's been just a shadow of it's former self.
edit: meh
