It wont. Obama didn't act in Syria, and he laid down for the Iranians over their nuke program, so you think he is going to do a damn thing against Russia? Not in a million years.
If Russia pulls their ambassador to the US that is a move by Putin to further embarrass the Obama administration in front of the entire world and especially in front of our NATO allies. It is a move to underline Obama's weakness and ineffectiveness as a leader. Just this week the Obama administration was calling for more military cuts. Putin would be foolish not to be taking these steps now with such a paper tiger as Obama in the white house. Putin is just looking after Russia's best interests in the region.
This is a perfect example of how a demonstration of weakness and lack of resolve on the part of the United States only makes the world less stable. This would have never happened when Reagan and Thatcher were leaders for the western powers. From the moment Obama took office and went on his worldwide apology tour, people like Putin were taking notes, and waiting for their moment. That moment is here.