(BBC News) The US military would have been within its rights to shoot down Russian aircraft that flew close to one of its warships in the Baltic Sea, Secretary of State John Kerry says.
Two Russian jets flew within metres of the ship on Monday, US officials said.
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Russia's defence ministry said the Su-24 fighter jets "turned away in observance of all safety measures" after observing the USS Donald Cook.
Mr Kerry criticised the gesture and said contact had been made with Moscow.