MOSCOW, April 8 (Reuters) - The Russian rouble weakened

slightly against the U.S. dollar on Monday.

By 0715 GMT the rouble was 0.14% down at

92.63 to the dollar after trading in a range of 92.450 to

92.690.

Against the euro, the rouble weakened by

0.14% to 100.30 and dropped 0.18% to 12.78 against the yuan

.

Brent crude oil, a global benchmark for Russia's

main export, fell 1.4% to $89.87 a barrel.

Russian stock indexes rose. The dollar-denominated RTS index

rose 0.53% to 1,162.01. The rouble-based MOEX Russian

index gained 0.66% to 3,417.88.

($1 = 92.6275 roubles)

(Reporting by Reuters

Editing by David Goodman

)