Kerry landed in the Iraqi capital just two days after newly sworn Prime Minister Haider al-Abadi seated his top government ministers, a crucial step toward restoring stability in a nation where security has spiraled out of control since the beginning of the year.
The trip marks the first high-level US meeting with al-Abadi since he become prime minister, and it aimed to symbolise the Obama administration's support for Iraq nearly three years after US troops left the war-torn country.
Al-Abadi's predecessor, former Prime Minister Nouri al-Maliki, for years shut Sunnis out of power and refused to pay tribal militias salaries or give them government jobs and in turn sowed widespread resentment that Islamic State extremists seized on as a recruiting tool.
Al-Abadi hosted Kerry in the ornate presidential palace where Saddam Hussein once held court, and which the US and coalition officials later used as office space in the years immediately following the 2003 invasion of Iraq.
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"Of course, our role is to defend our country, but the international community is responsible to protect Iraq, and protect the whole region," al-Abadi said, speaking in English.
"What is happening in Syria is coming across to Iraq. We cannot cross that border, it is an international border. But there is a role for the international community and for the United Nations ... And for the United States to act immediately to stop this threat."