MOSCOW, Dec 28 Reuters The Russian rouble firmed against the U.S. dollar and euro on Thursday, receiving support from monthend corporate taxes.

At 0743 GMT, the rouble was 0.9 stronger against the dollar at 90.46 .

It had gained 0.5 to trade at 100,70 versus the euro and also firmed 0.5 against the yuan to 12,67 .

The rouble continues to strengthen for the fourth day in a row. Thus, we can say that the measures taken by the authorities to curb the rouble39;s decline are clearly working, said Alor Broker39;s Alexei Antonov.

Since October and the rouble39;s most recent slide to 100 against the dollar, a presidential decree forcing exporters to convert some foreign currency revenue has provided support, as have elevated interest rates.

Brent crude oil , a global benchmark for Russia39;s main export, rose 0.05 to 79.69 a barrel.

Russian stock indexes were mixed.

The dollardenominated RTS index was up 0.59 at 1,075.02. The roublebased MOEX Russian index was 0.34 lower at 3,086.94.

Reporting by Marina Bobrova; editing by Guy Faulconbridge

Source Reuters