Speaking at an annual security conference, Shoigu accused Washington of seeking worldwide military and political dominance.

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He reiterated Moscow's line that the West orchestrates "colour revolutions" to unseat rulers it dislikes.

"Ukraine is the biggest tragedy in the chain of colour revolutions. The United States and its allies have crossed all possible lines in their drive bring Kiev into their orbit. That could not have failed to trigger our reaction," Shoigu cited in Moscow.

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Russian annexed the Crimean peninsula from Ukraine last March and separatist unrest then spread to eastern, Russian-speaking regions of the country.

Fighting between Kiev's troops and pro-Russian rebels there has killed more than 6,000 people.

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The West says Moscow has sent serving Russian troops to help the rebels as well as arms, training and intelligence.

Moscow denies direct military involvement in spite of mounting evidence on the ground. Shoigu blamed the fighting on Kiev and its drive to integrate with the West.

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