Iraq has asked the US to start withdrawing troops. If it doesn't, that's a breach of international law.
The Pentagon has spent more than $800 billion on military operations in Iraq. But that doesn't include money needed to care for veterans, rebuild the country or pay interest on war debt.
Iraqis have taken to the streets to protest against the foreign interference – by both Iran and the US – in their country.
A short history of modern Iran-Iraq relations.
Even when countries have broken ties with each other, they can communicate – as the US and Iran did just a few days ago.
Although neither side apparently wants conflict, tensions remain over the presence of US troops in Iraq and Iran's decision to walk away from part of the 2015 nuclear deal.
President Trump's speech about Iran wasn't just aimed at that country or the US. He also targeted NATO allies, urging members of the alliance to step up and help US efforts in the Middle East.
Tehran is making threats but its options are somewhat limited.
For decades, Iran has built up a network of proxies across the Middle East. Will it now use them to retailiate for the killing of its top general?
Given the perils of direct confrontation with the US, the most likely recourse for Iran may be to mobilise its proxy militias to attack American assets in Iraq.
Interviews with the Yazidi survivors of IS attacks that killed 3,100 people in 2014 reveal the emotional, cultural and spiritual scars of religious persecution.
Distrust of the US – even if misplaced – can linger for decades, thwarting Washington’s foreign policy goals. A former US diplomat in Iraq reflects on that country's skepticism of US aid efforts.
People get angry far more often than they rebel. And rebellions rarely become revolutions. An expert on the French Revolution explains why today's protest movements are different.
From US captive to head of Islamic State, the life of Abu Bakr al-Baghdadi, who died in Syria.
Iraq's 2005 constitution created a flawed political system built on sectarianism.
Why young Iraqis to took the streets in protests that left more than 100 people dead after a brutal suppression.
For Muslims, Ashura marks the martyrdom of the Prophet Muhammed's grandson Hussain.
Private military and security companies are increasingly being contracted in Africa. But there are big gaps in understanding their impact.
Turkey's authoritarian leader, Recep Tayyip Erdoğan, was handed a big defeat recently when his party's candidate lost a crucial election contest. Is this the beginning of Erdogan's demise?
The National Intelligence Council works inside government but is little understood outside. Yet it has helped respond to almost all the major foreign policy challenges of the last 40 years.