Across a huge swath of what, up until recently, had been known as Iraq and Syria, a transnational movement of Sunni Islamic extremists has taken control. The Islamic State of Iraq and Syria (ISIS) has conquered -- without much effort -- Mosul, Iraq's second largest city, along with most of the province of Nineveh. It also took Tikrit, Saddam Hussein's hometown. Along the way it has ransacked banks (to the tune of hundreds of millions of dollars), pillaged weapon stockpiles (including the stuff we left behind for the Iraqi army) and recruited ever more fighters from Iraq, Syria and abroad. Late Thursday, the Iranians finally sent troops to support the teetering government and managed to reclaim most of Tikrit. So either the regional war just got bigger, or Iraq is poised to become even more of an Iranian vassal.