U.S. Secretary of State John Kerry has tried to pressurize Iraq into cooperating over Syria  in a bid to stop Iran using their airspace to send weapons to Assad's regime, the BBC reported on Sunday.
During an unannounced visit to the troubled country, Kerry told Iraqi Prime Minister Nouri al Maliki  that his current policies were "problematic".
"I made very clear to the prime minister that the overflights from Iran are in fact helping to sustain President Assad and his regime," Kerry told reporters.
The Syrian regime is largely supported by arms shipments from both Iran and Russia . Although Iraq had promised to inspect any Iranian planes using their airspace, they have only checked two since last year, according to one U.S. official speaking to AP.
The same official said there were planes flying from Iran to Syria almost every day.
Kerry's visit to Iraq marks the first trip to the Shia-led country  by a U.S. secretary of state in four years.