US President Barack Obama and first lady Michelle Obama step off Air Force One upon their arrival at Stansted Airport, southern England March 31, 2009. [Agencies]
Britain's Prime Minister Gordon Brown (L) greets South Korea's President Lee Myung-bak at 10 Downing Street in London March 31, 2009. [Agencies]
Mexico's President Felipe Calderon arrives at Aberdeen Town House in Aberdeen, Scotland March 31, 2009. [Agencies]
US President Barack Obama (2nd R) and first lady Michelle Obama (R) walk with Britain's Charge D'Affair's Richard LeBaron (2nd L) and his wife Jean Foshee LeBaron upon their arrival on the grounds of Winfield House, the US Ambassador's London residence, March 31, 2009. [Agencies]
The G20 Summit will be held in London on Thursday.
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