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Gravesend in Kent was the warmest spot in the country, recording a temperature of 20.5C (68.9F) at 2.30pm today, according to the Met Office.
The last time the 20C mark was breached in Britain was on October 8 last year.
The United States will not recognise the annexation of Crimea by Russia if residents of the region vote to leave Ukraine in a referendum next week, US national security official Tony Blinken said.
US Secretary of State John Kerry has previously warned his Russian counterpart Sergei Lavrov that any steps taken by Russia to annex Ukraine's eastern region of Crimea, would close the door to diplomacy.
North Korean leader Kim Jong Un has voted in the election of a deputy to the Supreme People's Assembly.
North Korean voters are going to polling stations today to elect a new national legislature, but their choices are limited to only one candidate per district.
The vote for the Supreme People's Assembly is the first in five years and the first under leader Kim Jong Un.
Nick Clegg intends to remain as Liberal Democrat leader until at least 2020 - whether or not the party is in power - his office said today as speculation about the Deputy Prime Minister's future overshadowed his spring conference speech.
The Deputy Prime Minister was forced to respond to speculation about his future following reports that senior MPs were positioning themselves as possible successors.
"Nick Clegg intends to be the leader of the Liberal Democrats today, tomorrow, into the 2015 election and through the whole of the next parliament," a spokesman said.
"He intends to be leader of the Liberal Democrats whether or not we are in government."
The Arab League endorsed Palestinian President Mahmoud Abbas's rejection of Israel's demand for recognition as a Jewish state, as U.S.-backed peace talks approach a deadline next month.
The US want Mr Abbas to make the concession as part of efforts to reach a "framework agreement" and extend the talks aimed at settling the Israeli-Palestinian conflict.
Benjamin Netanyahu has been Israel's first prime minister to make recognition of his country as a Jewish state a requirement for peace.
US President Barack Obama will meet with Ukrainian Prime Minister Arseny Yatseniuk at the White House on Wednesday.
The White House called the meeting, which comes just days before a referendum on secession by Crimea, a "show of support for Ukrainian sovereignty."
The leaders are set to talk about "how to find a peaceful resolution to Russia's ongoing military intervention in Crimea that would respect Ukrainian sovereignty and territorial integrity," the White House said.
Chinese President Xi Jinping said the crisis in Ukraine needed to be solved via diplomacy.
In a telephone conversation with German Chancellor Angela Merkel, Mr Xi said solution needed to be on the basis of international law, German government said in a statement.
German Chancellor Angela Merkel told Russian President Vladimir Putin referendum planned for March 16 on Crimea joining Russia violated Ukraine's constitution and was against international law.
The Chancellor also said she regretted that there had not been any progress on forming an "international contact group" which could find a political solution to the crisis in Ukraine.