By Lynx Insight Service

MOSCOW, May 20 (Reuters) - The Russian rouble firmed

against the U.S. dollar on Monday.

By 0715 GMT, the rouble was 0.08% higher at

90.88 to the dollar after trading in a range of 90.840 to

91.150.

Against the euro, the rouble fell 0.09% to

98.83 and gained 0.29% to 12.54 against the yuan

.

Brent crude oil, a global benchmark for Russia's

main export, rose 0.4% to $84.29 a barrel.

Russian stock indexes rose. The dollar-denominated RTS index

rose 0.47% to 1,217.59. The rouble-based MOEX Russian

index gained 0.3% to 3,512.56.

($1 = 90.8775 roubles)

(Reporting by Reuters)