MOSCOW, April 18 (Reuters) - The Russian rouble slightly

weakened against the U.S. dollar on Thursday.

By 0717 GMT, the rouble was 0.13% lower at

94.40 to the dollar after trading in a range of 94.200 to

94.400.

Against the euro, the rouble fell 0.46% to

100.85 and dropped 0.22% to 13.01 against the yuan

.

Brent crude oil, a global benchmark for Russia's

main export, rose 0.1% to $87.33 a barrel.

Russian stock indexes fell. The dollar-denominated RTS index

fell 0.21% to 1,151.82. The rouble-based MOEX Russian

index lost 0.08% to 3,451.21.

($1 = 94.3950 roubles)

(Reporting by Reuters)