April 21 (Reuters) - The Russian rouble weakened slightly on Friday, with lower oil prices blunting the impact of upcoming month-end tax payments that usually benefit the Russian currency.
At 0715 GMT, the rouble was 0.2% weaker against the dollar at 81.70 and was unchanged, trading at 89.53 versus the euro. It had shed 0.1% against the yuan to 11.83.
The rouble should get a delayed boost from this month's higher oil prices, which translate into higher export revenues.
Brent crude oil, a global benchmark for Russia's main export, jumped to 2-1/2-month highs after OPEC announced surprise supply target cuts in early April.
But Brent has sharply dropped in recent sessions, down 0.6% on Friday to $80.6 a barrel, its weakest mark since May 31.
The rouble is expected to gain support from month-end tax payments that usually lead exporters to convert foreign currency revenues to meet local liabilities. Those taxes are due on April 28.
Russian stock indexes were mixed.
The dollar-denominated RTS index was down 0.1% at 1,018.2 points. The rouble-based MOEX Russian index was 0.2% higher at 2,641.2 points, hitting a more than one-year high.
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(Reporting by Alexander Marrow;Editing by Elaine Hardcastle)
