Saudi Arabia and the UAE have accused Qatar of supporting the Muslim Brotherhood, a terrorist organization, accused of destabilizing their close ally Egypt.
Saudi Arabia, Qatar and the UAE are big supporters of Syrian rebels fighting President Bashar al-Assad, an ally of Iran.
In Libya, Qatar has backed some Islamist groups. UAE and Egypt had been involved in air strikes against Libyan Islamist groups.
In late 2011 Saudi Arabia pushed for Gulf Cooperation Council members to unite "as a single entity" in a bid to join the group of six monarchies into a united front against Iran and the instability caused by that year's Arab uprisings.
However, the GCC, which also includes Kuwait and Oman, appears more divided.
Add Israel, Iraq, Syria, Libya, Lebanon, Jordan, and Iran to the mix and you can see where the money is coming from and the killing is going to.
John Kerry is going to the Middle East to create a front against ISIL, or looking for a needle in a haystack. Just a thought.