Iran's Supreme Leader Ayatollah Ali Khamenei said on Tuesday on his website that the United States has plans to divide Iraq on an ethnic and sectarian basis and urged Iraqis resist such plans.
"The Americans must not be allowed to consider Iraq as their personal property ... and dare to openly talk about the disintegration of Iraq," Khamenei said.
Iran has extended its influence in Iraq since its military advisers began supporting the Iraqi Army in its campaign against DAESH which has been seizing swathes of Iraqi territory since last year.
Furthermore, Iran has recently criticised America's policy in Iraq several times.
"The Iraqi people, Shiites, Sunnis, Kurds and Arabs have been living together peacefully but some regional countries and some foreigners are trying to amplify differences among them," Khamenei said.
On Tuesday, Khamenei met with Iraqi President Fouad Massoum on the sidelines of the summit of the Gas Exporting Countries Forum (GECF) which was being held in Tehran.
The US is leading a coalition which started targeting DAESH in 2014 in Iraq and Syria and has 3,360 troops currently deployed in Iraq.
Iran is backing the Shiite Iraqi Popular Mobilization Forces in their fight against DAESH.
On Monday, Khamenei called for closer cooperation between Iran and Russia during a meeting with Russian President Vladimir Putin.