Leaving the formality of the White House, they sneaked away for an impromptu ride across the Potomac River to a popular hamburger joint — Ray's Hell Burger in Arlington, Va. Customers cheered when the two walked in.
Later, at the news conference, Medvedev called the burgers "probably ... not quite healthy but it's very tasty."
After their joint news conference, Obama and Medvedev were going together to the U.S. Chamber of Commerce.
Ahead of the talks, U.S. officials pointed to signs that Obama's much-heralded efforts to start fresh with Moscow have delivered results, from Russian support for new U.N. sanctions against Iran over its disputed nuclear program to the signing of a major treaty to reduce the two countries' stockpiles of nuclear weapons. They say the U.S. is standing its ground with Russia but shifting the tone away from conflict.
But conservative critics see Obama as too conciliatory and say he hasn't resolved disputes over issues such as Moscow's human rights record, missile defense and the legacy of the Russia-Georgia war of 2008. They charge that by speaking softly on those issues, the United States is compromising its influence among Russia's neighboring countries.
Medvedev began his U.S. visit in California, where he toured Silicon Valley high-tech firms as part of his push to establish a high-tech center in Russia.