MOSCOW, May 17 (Reuters) - The Russian rouble was mostly unchanged against the U.S. dollar on Friday.

Against the euro, the rouble fell 0.09% to 98.95 and was unchanged at 12.59 against the yuan .

Brent crude oil, a global benchmark for Russia's main export, rose 0.6% to $83.78 a barrel.

Russian stock indexes rose. The dollar-denominated RTS index rose 0.14% to 1,209.67. The rouble-based MOEX Russian index gained 0.26% to 3,495.44.

(Reporting by Reuters; Editing by Alison Williams)