From the Article:
"For the first time since the crisis erupted, senior U.S. officials complained of difficulty tracking Russian troop movements. They said the expected redeployment of Russian security forces following the end of the Olympic Games in Sochi, as well as routine military exercises in the area, had complicated the task of determining how many Russian troops are still pouring into Crimea. "

Feint, misdirection and deceit are the normal mode of operation for any military operation. Just as Saddam Hussein Why would we expect the Russians to be any different from us in military strategy and Tactics? They are master chess players and Putin is playing for his political life now..