This happened yesterday. My analysis on the situation; the kuffaar fear that if Somalia becomes an Islamic state it will become a safe haven for "terrorists" like the Islamic Emirate of Afghanistan before 2001. Also, the Shabaab have promised to continue their Jihad until they reach Bayt al-Maqdis, this means that they will have to go through the sold out Arab states, the closest ones being Yemen & Egypt if they want to reach Palestine. Thus these puppets want to protect their thrones and send in their troops (with the blessings of the West).
But let this not come as a surprise, the Arab gov. have been fighting Islam for long, not to forget all the members of the league consist of puppets such as, Hosni no-Mubarak, AbdDollar of Saudi, AbdDollar of Jordan,Ali AbdDollar of Yemen etc.