LONDON - President Barack Obama has arrived in Europe, with a hefty economic and political agenda for his first journey across the Atlantic since taking office two months ago. The first stop for the president and first lady Michelle Obama was London. Obama's focus is a G-20 meeting of the world's major economic powers and a NATO summit marking the 60 years since the alliance was founded to blunt Soviet aggression in Europe.

Obama is on an eight-day, five-country trip. He...