Nearly 100,000 Russian forces have massed on Ukraine's border, a top Ukrainian defense official told an American audience Thursday, giving a number far higher than US military estimates. "Almost 100,000 soldiers are stationed on the borders of Ukraine and in the direction ... of Kharkiv, Donetsk," Andriy Parubiy, chairman of Ukraine's national security council, said via a webcast from Kiev. "Russian troops are not in Crimea only, they are along all Ukrainian borders. They're in the south, they're in the east and in the north," Parubiy said.