* Rouble recovers after informal capital controls

* Market watching oil price, S&P ratings verdict

* Inflation tops 10 pct for first time since 2009

* Forex reserves drop by $15.7 bln in one week (Adds drop in forex reserves)

By Elena Fabrichnaya and Alexander Winning

MOSCOW, Dec 25 (Reuters) - Russia said on Thursday its currency crisis was over even though its forex reserves have plunged and annual inflation has climbed above 10 percent, adding to the problems facing the government as it fights its worst economic crisis since 1998.

The rouble plunged to all-time lows last week on heavy falls in the price of oil, the backbone of the Russian economy, and Western sanctions over the Ukraine crisis that made it near impossible for Russian firms to borrow on Western markets.

But it has since rebounded sharply after authorities took steps to halt its slide and bring down inflation, which after years of stability threatens President Vladimir Putin's reputation for ensuring the country's prosperity.

Those measures included a hike in interest rates to 17 percent from 10.5 percent, curbs on grain exports and informal capital controls.

"The key rate was raised in order to stabilise the situation on the currency market. ... That period has already, in our opinion, passed. The rouble is now strengthening," Finance Minister Anton Siluanov told the upper house of parliament on Thursday.

He added that interest rates would be lowered if the situation remained stable.

Standard & Poor's credit ratings agency said this week it could downgrade Russia to junk as soon as January due to a rapid deterioration in "monetary flexibility".

Keen to avert a downgrade, Russia said it had started talks with ratings agencies to explain the government's actions. Siluanov said the budget deficit next year would be "significantly more" than the 0.6 percent of gross domestic product originally planned.

The rouble slumped to 80 per dollar in mid-December from an average of 30-35 in the first half of 2014. It has strengthened in the last few days to trade as strong as 52 per dollar on Thursday, in part thanks to government pressure on exporters to sell hard currency.

Russians have tracked the exchange rate closely since the collapse of the Soviet Union, when hyper-inflation wiped out their savings over several years in the early 1990s. The central bank had to spend heavily in recent months to prop the currency.

Last week, Russia's gold and foreign currency reserves dropped by as much as $15.7 billion to below $400 billion for the first time since August 2009 and down from over $510 billion at the start of the year.