The arrival of the fighter jets comes with Iraqi forces, backed by aerial cover, pushing to retake the militant-held city of Tikrit and world leaders urging a speeding up of government formation following elections in April.
The newly-purchased Su-25 ground attack jets are expected to be pressed into service as soon as possible, bolstering Iraq's air power as it combats a sweeping offensive by militants, led by the jihadist Islamic State of Iraq and the Levant, that has killed more than 1,000 people and sparked a humanitarian crisis with hundreds of thousands displaced.
Iraqi Prime Minister Nuri al-Maliki on Thursday announced that Baghdad was buying more than a dozen of the warplanes from Russia in a deal that could be worth up to USD 500 million (368 million euros).
While Washington has begun sending military advisers to help Iraqi commanders and is flying armed drones over Baghdad, Iraqi officials have voiced frustration that multi-billion dollar deals for US-made F-16s and Apache helicopters have not been expedited.
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Thousands of soldiers, backed by tanks and bomb disposal units, have been engaged in the battle for the city -- with air strikes adding firepower to the counter-offensive.
According to Maliki's security spokesman, Iraqi forces are coordinating with US advisers over "important targets" of the air attacks.
The spokesman has said hundreds of soldiers have been killed since the offensive was launched on June 9, while the UN puts the overall death toll at over 1,000, mostly civilians.
US officials have also said a proposed USD 500-million plan to arm and train moderate rebels in neighbouring Syria could also help Iraq fight ISIL, which operates in both countries.