"We've certainly seen those reports. If true, this would raise serious concerns," State Department spokeswoman Jen Psaki yesterday said.
A deal signed in November in which Iraq would buy USD 195 million in arms from Iran was reported by Reuters in Baghdad yesterday.
Psaki said that "any transfer of arms from Iran to a third country is in direct violation" of the UN embargo.
"We are seeking clarification on this matter from the government of Iraq and to ensure that Iraqi officials understand the limits that international law places on arms trade with Iran," she added.
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In early January, Iran's deputy chief of staff General Mohammad Hejazi said that his country was ready to provide military equipment and advice to Iraq as it battles al-Qaeda. Maliki payed a visit to Iran one month later.
To help Iraq fight al-Qaeda and other Sunni extremist groups, such as the jihadist Islamic State of Iraq and the Levant (ISIL), Washington has recently promised to speed up its delivery of Hellfire missiles and surveillance drones. The Pentagon is ready to sell more missiles and 24 Apache attack helicopters.
She added that the United States has provided more than USD 15 billion in equipment, services and training to Iraqi armed services and security.