By Josie Cox and Tommy Stubbington 

European markets endured another turbulent session Wednesday, buffeted by a fresh slump and then a sudden and ferocious recovery in the price of oil.

Brent crude, which is still down almost 40% so far this year, climbed as high as $63 a barrel in late European trade, a 5% appreciation on the day.

The commodity has repeatedly hit multi-year lows in recent days, but some analysts Wednesday said that investors may now be attempting to call the bottom of the slump.

"There might be a degree of short coverage ahead of the holidays," said Gareth Lewis-Davies, an analyst at BNP Paribas. "It is also possible that some people are trying to call the bottom of the market, but it is too early to say if this is it," he added. "Things could quickly reverse."

Stocks in Europe rose in response to the move. Having fallen in early trade, mirroring a late slump on Wall Street Tuesday, the Stoxx Europe 600 ended the session up 1%.

London's FTSE 100--with significant exposure to the oil and gas sector through the likes of BP PLC and Royal Dutch Shell Group PLC--finished 0.1% higher too, as Brent crude crept around 1.5% higher on the day to $60.9 a barrel.

Even the Russian ruble enjoyed some respite.

The dollar declined almost 13% against the currency to around 60.66 in late European trade, after the country's finance ministry said it has started selling its excess foreign currency holdings on the market.

Earlier this week, the central bank dramatically increased the country's key interest rate by 6.5 percentage points to 17% in a desperate attempt to stem outflow, before the ruble on Tuesday tumbled to yet another all-time low against the dollar.

Even though the ruble remains more than 45% lower against the dollar so far this year, some investors Wednesday adopted a less pessimistic tone on the Russian economy, than they've had in recent days.

"Over the medium to longer term, we continue to expect fundamentals to reassert themselves to drive the equity market higher," said Michael Levy, investment manager at Baring Asset Management, which manages around EUR36 billion ($45 billion).

"We scaled back our exposure to Russia as the situation in the Crimea escalated and are monitoring the latest developments closely, with a view to taking action as required," he said.

Moscow's Micex index ended the session 2.1% higher on the day, while the dollar-denominated RTS index surged 14%, and David Kohl, head of currency research at Julius Baer, said that he no longer suggests selling the ruble--a recommendation he'd maintained since April 2014.

"From a fundamental point of view the ruble is attractive and is slowly becoming very attractive," he said.

The vast majority of asset managers, strategists and economists, however, remain cautious, warning that it would be much too early to say the crisis is over.

"Confidence in the country's currency and central bank have been completely undermined," said Karl Steiner, a strategist at SEB. "The central bank will probably increase its efforts to try to stop the development, but experience shows that such a development is difficult to reverse once it has been set in motion," he added.

Elsewhere on Wednesday, more volatility could stem from the latest policy statement from the U.S. Federal Reserve as well as the outcome of the first of up to three votes in the Greek parliament to decide on a new president.

The Fed is expected by many to change its forward-looking policy statement by removing language that it expects to keep interest rates low "for a considerable period."

That could further unsettle markets, with the prospect of higher U.S. rates making many emerging currencies less attractive to investors.

Despite the ruble's rebound, the South African rand continued to weaken against the dollar, dropping 0.6% to 11.73 Wednesday. The Nigerian naira, another currency closely linked to oil prices, fell to an all-time low against the dollar.

The S&P 500 was up around 1% on the day in late European trade.

In Greece, meanwhile, lawmakers completed the first round of voting on the country's president Wednesday, failing to reach the supermajority needed to approve the candidate named by Prime Minister Antonis Samaras, as expected.

With uncertainty still high, investors continued to seek the safety of German bonds, with 10-year yields remaining at an all-time low of 0.57%.

The euro was around 0.7% weaker against the dollar at $1.2415 in late trade. Gold edged 0.1% higher to $1,195.30 per troy ounce.

--Georgi Kantchev contributed to this article

Write to Tommy Stubbington at tommy.stubbington@wsj.com and Josie Cox at josie.cox@wsj.com

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