WASHINGTON, March 17 – Russia has not only acknowledged to the world that Russian forces really intervened in Crimea, but that they were prepared to take even more aggressive action, U.S. Department of State Spokesperson Jen Psaki said.

"I think not only that – did he acknowledge to the world that Russian forces did in fact intervene, but that they were prepared to take even more aggressive action," she said when being asked to comment Putin's interview when he said he had his nuclear forces on high alert during his incursion into Crimea.