Yeh I agree with Ozex. Use the word "require" and not "request". Around here, "request" is used all the time. I even heard an A-310 "request diversion to XXXX and request descent to FLXXX" after he lost an engine!
What annoys me in this part of the world is when diversions are required due to wx, ATC comes back and says "negative due traffic". On analysis, the other aircraft only needs to turn another 10 or 20 degrees further into clearer air to accommadate our diversion. I dont know if its just ATC lazyness or pure lack of intelligance.
Worst ATC for wx diversions are BKK, RGN (Rangoon), HAN (Ha bloodey Noi), most places in China. In many cases youd swear I asked him if I could bed his missus!