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"A year ago, President Putin announced to the world that the Russian armed forces did not intervene in the situation in the Crimea. Today, he admits to the whole world that the Russian troops actually intervened - and these are his own his own words," Psaki said.

"I think that the Russian Federation has admitted to the whole world not only its military intervention, but also that they were ready to take more aggressive actions," Psaki said, commenting on Vladimir Putin's words that he was ready to place Russia’s nuclear forces on alert in March 2014.