Oil price rises as Russia and Saudi Arabia back supply cut
Oil prices have risen more than 2% after Saudi Arabia and Russia said a deal to cut production should be extended until March next year.
A barrel of Brent Crude jumped to $52.20 following a meeting in China between the two countries.
The oil cartel Opec, which is dominated by Saudi Arabia, and non-Opec producers led by Russia have been attempting to use the output cut to drive up prices.
However, the US is not included and its high output could undermine efforts.
Following the meeting in Beijing, Saudi Energy Minister Khalid al-Falih and his Russian counterpart Alexander Novak said: "The two ministers agreed to do whatever it takes to achieve the desired goal of stabilising the market and reducing commercial oil inventories to their five-year average level."
Mr Falih added: "We've come to the conclusion that the agreement needs to be extended."
The two countries produce 20 million barrels of crude oil a day - about one-fifth of global consumption - and other oil-producing nations are expected to follow their lead over cuts.
Russian President Vladimir Putin said extending output cuts for a further nine months was the right thing to do: "We support the proposal."
An agreement to cut production was reached in September last year, but the deal was due to run out later this year.
Under the agreement, Opec countries were to cut production by 1.2 million barrels a day, while the Russian-led non-Opec nations agreed to reduce output by 600,000 barrels a day.
Earlier this month, oil prices hit a five-month high, but have wobbled over fears that producers may be unwilling to hold their nerve and limit production.
The US has also refused to cut production and its own output has increased by about 10% since last year.
In recent years Saudi Arabia has been in a pitched battle with the US to try to reduce the price of oil.
It has been concerned with the increase in US shale gas production, and so increased its oil output to drive down prices in a bid to make shale gas exploration economically unattractive.
However, last year Saudi officials agreed to the first cut in production for eight years.
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