MOSCOW, March 29 (Reuters) - The Russian rouble

strengthened slightly against the U.S. dollar on Friday.

By 0722 GMT, the rouble was 0.23% higher at

92.28 to the dollar after trading in a range of 92.135 to

92.690.

Against the euro, the rouble rose 0.52% to

99.47 and gained 0.59% to 12.64 against the yuan

.

Brent crude oil, a global benchmark for Russia's

main export, rose 1.9% to $87.07 a barrel.

Russian stock indexes were mixed. The dollar-denominated RTS

index rose 0.14% to 1,129.80. The rouble-based MOEX

Russian index lost 0.12% to 3,308.96.

($1 = 92.2800 roubles)