Obama tells France, Germany, Italy, Britain to safeguard EU after Brexit vote

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The leaders of the five leading NATO states, known as the Quint, also met with Ukraine's President Petro Poroshenko to express their support for Kiev after Russia annexed its Black Sea peninsula of Crimea and then backed rebels in east Ukraine.

Italy's Prime Minister Matteo Renzi (L-R), Britain's Prime Minister David Cameron, Ukraine's President Petro Poroshenko, U.S. President Barack Obama, Germany's Chancellor Angela Merkel and France's President Francois Hollande stand for a photograph after their meeting. Photo by Reuters/Jonathan Ernst

"The leaders agreed that Ukraine has made considerable progress on political, economic, and anti-corruption reforms, but that more work must be done to consolidate these gains," the official said.

"The leaders reaffirmed that sanctions should only be lifted once Russia fulfils all of its Minsk commitments," the official said, referring to a troubled peace process in east Ukraine.

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