MOSCOW, April 12 (Reuters) - The Russian rouble weakened

against the U.S. dollar on Friday.

By 0721 GMT), the rouble was 0.33% lower at

93.57 to the dollar after trading in a range of 93.205 to

93.728.

Against the euro, the rouble rose 0.02% to

99.98 and dropped 0.26% to 12.89 against the yuan

.

Brent crude oil, a global benchmark for Russia's

main export, rose 0.9% to $90.55 a barrel.

Russian stock indexes were mixed. The dollar-denominated RTS

index fell 0.03% to 1,161.98. The rouble-based MOEX

Russian index gained 0.36% to 3,451.41.

($1 = 93.5725 roubles)