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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.
Two Chinese warships are to join the USS Pinckney, an Arleigh Burke-class guided missile destroyer, in the search for a missing Malaysia Airlines flight, Chinese state media reported.
Two warships of Chinese navy are on their way to sea area where missing Malaysia Airline flight MH 370 may have crashed
Thai navy is prepared to send 3 vessels and 1 aircraft to join search and rescue of missing Malaysian plane, a navy spokesman says
The USS Pinckney, an Arleigh Burke-class guided missile destroyer, is en route to southern coast of Vietnam to help search flight MH370
Chinese Foreign Minister Wang Yi has told reporters in Beijing that China was "extremely worried" about the fate of those on board a missing Malaysia Airlines aircraft.
According to state news agency Xinhua, he said: "This morning, we got some very worrying news, a Malaysian airliner en route to China lost contact, we are very worried, I hope everyone is safe. The Ministry of Foreign Affairs and the embassies concerned have launched an emergency operation."
Chinese relatives of passengers angrily accused the airline of keeping them in the dark, while state media criticised the carrier's response as poor.
A team of women artists hope they have spray-painted their way into the record books.
As part of global events marking International Women's Day, up to 106 people aimed to create the largest spray-paint mural by multiple artists in a tunnel in Waterloo, south east London.
They are still waiting for confirmation that their efforts have clinched the Guinness World Record.
Organiser Rosalia Ferrara said the newly-transformed Leake Street Tunnel, which was first covered in bubblegum pink paint as a backdrop, "is looking amazing".
The participants created a series of images on the theme of "It's is a woman's world" which were then linked together as a mural.
The artists, who come from Britain and abroad, each paid a £2.50 registration fee to take part in the record attempt. All the money, including the cash donated throughout the day, is going to Breast Cancer Care.
A Malaysia Airlines flight that went missing early this morning is reported to have had no technical issues during its regular check ten days ago, Chinese state news agency Xinhua said.
The airline held a press conference in Beijing today over the missing aircraft, which had 239 people on board.
No technical problems found in regular check of the missing Boeing 777-200 aircraft ten days ago, Malaysia Airlines' spokesman says
Microblog: Malaysia Airlines hold press conference in Beijing on missing flight http://t.co/9YcI3lnpPd
A working group of the Malaysia Airlines arrives in Beijing to handle the missing of flight MH370
US and EU leaders have rejected a proposed referendum in Ukraine's eastern region of Crimea, after Russia called for the Crimean people to decide whether they want to leave Ukraine or become part of the Russian federation. In a statement issued by the White House:
All of the leaders agreed on the need for Russia to pull its military forces back to their bases, allow for the deployment of international observers [...] agree quickly on the formation of a contact group that could lead to direct dialogue between Ukraine and Russia to de-escalate the situation and restore Ukraine’s sovereignty and territorial integrity.
The leaders rejected the proposed referendum in Crimea as a violation of Ukraine’s constitution and underscored that all decisions about the future of Ukraine must include the government in Kyiv.