MOSCOW, May 28 (Reuters) - The Russian rouble

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

By 0715 GMT, the rouble was 0.23% higher at

88.42 to the dollar after trading in a range of 88.358 to

88.700.

Against the euro, the rouble rose 0.15%

to 96.13 and gained 0.22% to 12.15 against the yuan

.

Brent crude oil, a global benchmark for Russia's

main export, fell 0.1% to $83.05 a barrel.

Russian stock indexes rose. The dollar-denominated RTS index

rose 0.38% to 1,178.36. The rouble-based MOEX Russian

index gained 0.26% to 3,307.66.

($1 = 88.4200 roubles)