US President Barack Obama left Portugal late Saturday after a two-day summit with NATO allies and European Union partners, a White House spokesman said.
Air Force One left Lisbon's international airport around 2030 GMT and was expected to land in the United States around 10:00 pm local time (0300 GMT Sunday), according to the president's daily schedule.
The weekend NATO summit wrapped up with the leaders agreeing to bring the war in Afghanistan to an end within four years, and succeeding in winning over Russia to cooperate in developing a European anti-missile shield.
Obama also met Saturday with EU leaders on concerns over the current economic crisis and urged major economies to avoid waging a war of competing currency devaluations.
The US president also used the occasion to garner support from the 28-nation NATO alliance to defend the START nuclear disarmament treaty with Russia which must be ratified by the US Senate.
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