Iraqi Prime Minister Nouri Maliki has arrived in Iran for talks aimed at improving relations between the two neighbouring countries.
He is expected to raise allegations of Iranian support for violent Shia militias in Iraq.
Also on the agenda are the ongoing US-Iraqi talks over the two countries' future, long-term relationship.
Mr Maliki, on his third visit since taking office, was met in Tehran by Iranian Vice-President Parviz Davoudi.