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The US Navy has dispatched a warship to help the search for a missing Malaysia Airlines jetliner.
The USS Pinckney, an Arleigh Burke-class guided missile destroyer, is on its way from international waters in the South China Sea to the southern coast of Vietnam to assist the hunt for flight MH370.
Britain is set to bask in the highest temperatures of the year so far on Sunday - warmer than some holiday spots in the Mediterranean, according to forecasters.
The Met Office says temperatures will reach 18C (64.4F) in parts of England - and "exceptionally mild" for the time of year and above places such as Greece and Turkey.
Saturday's highest temperature was recorded at 16.6C (61.9F) at around 2pm in St James's Park in central London.
Western leaders were engaged in renewed efforts to secure a diplomatic solution to the Crimea crisis tonight - as a team of observers was once again denied entry to the peninsula.
In one of a series of telephone calls between allied capitals, David Cameron and Barack Obama were said to have agreed the need to persuade Russia to withdraw its forces and enter talks with Ukraine.
But the Prime Minister and US President renewed the threat of "further consequences" for Moscow if it sought to legitimise the "illegal" planned referendum in Crimea on becoming part of Russia.
A North Korean-flagged tanker has started loading oil at a Libyan port seized by rebels in the east of the country, port and oil officials said on Saturday.
The Libyan government has threatened to sink the tanker if it attempts to leave the port at Es Sider in Ras Lanuf. The rebels aim to sell the oil and bypass the government to gain a share of the country's considerable oil wealth.
"The loading has started," a port worker told Reuters. A spokesman for state-run National Oil Corp (NOC) confirmed this.
The Prime Minister and his Canadian counterpart Stephen Harper have discussed "the need" for the International Monetary Fund to provide financial assistance to Ukraine, Downing Street said.
In a statement, Downing Street said David Cameron and Mr Harper urged the IMF "to lead on a package of financial assistance to the Ukrainian government to help provide economic stability in the months ahead and to ensure that the new Ukraine government implements the necessary economic reforms".
There is still no sign of the Boeing 777 that disappeared from radar carrying 239 people early this morning, Malaysia Airlines officials has said during a news conference in Beijing.
"We are not hiding anything. Information that comes through we have actually transposed to you guys as well," said Ignatius Ong, the Chief Executive Officer of Firefly, a Malaysia Airlines subsidiary.
Ong arrived in Beijing with a team of 93 counsellors, most of them Mandarin speakers, that will provide psychological support to the relatives of the passengers.
The Prime Minister and President Obama are said to have agreed the need to persuade Russia to withdraw its forces and enter talks with Ukraine.
David Cameron is due to travel to Germany tomorrow where he will meet Chancellor Angela Merkel. In a statement following the call with Mr Obama, a Number 10 spokeswoman said:
We should all work together to persuade President Putin to choose this diplomatic path out of the crisis.
Both the Prime Minister and the President firmly believe that the proposed referendum in Crimea would be illegal and that any attempt to legitimise it would result in further consequences for Russia.
A pensioner is in a critical condition after being pulled from a river by a passer-by.
The man was airlifted to a hospital in Lincoln after being rescued from the River Trent near Newark Castle at about 5.30pm today.
Nottinghamshire Police are carrying out inquiries into the circumstances surrounding how the man came to be in the water and are appealing for witnesses to contact officers on 101.