If you look at price action from the beginning of 2013, you can see that Japan's Nikkei has gained the most, followed by the SPX, London's FTSE, Germany's DAX, France's CAC, and Australia's AORD. The laggards have been the BRIC countries, although India is slightly in the green for the year. This is more easily seen on the following Year-to-date percentage gained/lost graph.
This news has just been released regarding the ECB's EFSF (I've written about the EFSF and the OMT here relative to the OMT's legitimacy):
Any substantial weakening of the EU countries (particularly below the 50 MA) in response to this news could have a negative affect on the SPX, as well as the already-depressed BRIC countries...ones to watch over the days/weeks to come.