"Russian troops are involved in "direct military operations" inside Ukraine, NATO Secretary-General Anders Fogh Rasmussen said Friday. "Despite Moscow's hollow denials, it is now clear that Russian troops and equipment have illegally crossed the border into eastern and south-eastern Ukraine," he said in a statement. "This is not an isolated action, but part of a dangerous pattern over many months to destabilize Ukraine as a sovereign nation."

NATO Chief Rasmussen: Russian Troops Are Fighting Inside Ukraine