Buran made only one unmanned flight in 1988 before the program was shut down. It wasn’t an EXACT copy. The Soviet design incorporated remote control for landing and,IIRC, jet engines to allow atmospheric powered flight after reentry.
http://en.wikipedia.org/wiki/Buran_(spacecraft)
As for the T-50, WOW! they are now up to two. (Although I suspect some Photoshopping might be going on in the photo at the head of the comments column.)
The US is building/has built what? ...about 200 F-22s (wish it was more) and will be building several thousand F-35s.
Yeah, those two Russian T-50s have me sleepless at night. (Same thing for the PRC stealth fighter, the Chengdu J-20.)
http://en.wikipedia.org/wiki/Chengdu_J-20
The one time I saw photos of it, my first impression was that is was “prettier” than ours, in that they had rounded off some sharp corners, etc. But.....copying the APPEARANCE of something, as opposed to duplicating the PERFORMANCE of something, are orders of magnitude apart! Here’s a link to an article and photo of it.
http://en.wikipedia.org/wiki/Buran_(spacecraft)