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(CNN) – The United States said it has proof that Russia is firing into Ukraine.
"We have new evidence that the Russians intend to deliver heavier and more powerful multiple rocket launchers to the separatist forces in Ukraine and have evidence that Russia is firing artillery from within Russia to attack Ukrainian military positions," said State Department spokesoman Marie Harf.
Two U.S. officials said earlier Thursday that Russian troops near the border with Ukraine have broken up into smaller groups and moved closer to the border.