On April 30th, months into Iraq’s political crisis and two days after the visit of US Vice-President Joe Biden to Iraq, loyalists of conservative Shia cleric Muqtada al-Sadr broke down the high concrete walls surrounding central Baghdad’s Green Zone in a challenge to the tacit agreement between the United States and Iran. Al-Sadr’s move shows how fragile is situation in Iraq and how quickly United States can lose control over country it once ruled. Read my latest piece on Iraq.