Yet, it can be very simple.
SYRIA:
Contradictions have been always the name of the game in politics, allies of yesterday become the enemies of today.
Syria for example, since the good event of Saddam removal in April 2003, that government cooperated with Islamists to destabilize Iraq to the maximum possible degree. [see: Blog Entry]

1. Italian police uncover al-Qaeda link in Syria - War on Iraq - smh.com.au
2. U.S., Iraqis Crack Down on Porous Syrian Border - Los Angeles Times

...