MOSCOW, Jan 25 (Reuters) - The Russian rouble steadied on Thursday, trading not far from the more than six-month high it hit last week, supported by capital controls, foreign currency sales and relatively high oil prices.

At 0736 GMT, the rouble was unchanged against the dollar at 88.59 and had gained 0.2% to trade at 96.46 versus the euro. It had firmed 0.1% against the yuan to 12.34.

Russian authorities publicly disputed the efficacy of capital controls earlier this week, with the central bank swiftly opposing the government's proposal to extend a requirement forcing exporters to convert foreign currency revenues.

The market is looking for signals as to what decision may be taken. The controls are currently set to remain in place until April 30.

State FX sales at the equivalent of 16.7 billion roubles ($188.4 million) a day are also buttressing the rouble, as are month-end tax payments that usually lead exporters to convert FX revenues to meet local liabilities.

"Despite support from the approaching tax period's peak, the dollar-rouble pair has not started testing the support level of 87.5," said Alor Broker's Alexei Antonov. "It is possible that exporters have already accumulated the bulk of roubles to pay January taxes."

Brent crude oil, a global benchmark for Russia's main export, was up 0.5% at $80.44 a barrel.

Russian stock indexes were lower.

The dollar-denominated RTS index was down 0.3% to 1,120.3 points. The rouble-based MOEX Russian index was 0.4% lower at 3,150.2 points.

For Russian equities guide see

For Russian treasury bonds see ($1 = 88.6350 roubles) (Reporting by Alexander Marrow Editing by Mark Potter)