Obama leaves US on final foreign trip to Greece, Germany and Peru

US President Barack Obama headed across the Atlantic late Monday on his final foreign trip while in office -- a farewell tour of Europe and a summit with Asia-Pacific leaders to reassure concerned allies after Donald Trump's election.

Obama will first go to Greece, where he will visit the Parthenon and hold talks with the country's leaders, and Germany, for key discussions with German Chancellor Angela Merkel, long one of his closest foreign partners.

The American president will conclude his trip with a stop in Peru for a summit of the Asia-Pacific Economic Cooperation forum (APEC). Among the leaders he is expected to meet there is President Xi Jinping of China.