WASHINGTON ( CNN ) -- Iran poses a significant threat to Iraq , but security has greatly improved in the war-ravaged country , according to a Pentagon report . Iraqi soldiers parade in Kirkuk on January 10 . The Pentagon credits better forces for improved security . The Pentagon assessed progress in Iraq from September to November in its quarterly report to Congress , issued on Tuesday . Iran `` continues to reflect a fundamental desire to oppose the development of a fully secure and stable Iraq , '' despite its `` persistent promises to the contrary , '' the report said . Iran tried to undermine the U.S.-Iraqi security agreement forged last year , the report said , and `` continues to host , train , fund , arm , and direct militant groups intent on destabilizing Iraq . '' `` Countering malign influence and balancing soft Iranian influence remain priorities to stabilize Iraq and ensure the sovereignty of its people , '' the report said . The report cites improvements in politics , security , economics , diplomacy and rule of law , but emphasizes their fragility . `` Iraq remains fragile because its major power brokers do not share a unified national vision . They disagree on the nature of the state and are reluctant to share power and resources , '' it says . `` The overall security situation in Iraq continues to improve , '' the Pentagon report says , crediting , among other things , improved Iraqi security forces and the political will of the government to fight militants . It says the insurgency has diminished as some militants embrace the Iraqi government . The U.S.-led coalition has transferred security leadership to Iraqi forces in several provinces and coalition troops from many countries have withdrawn their forces . The United States and Iraq have signed a bilateral security agreement calling for all U.S. troops to leave by the end of 2011 . Although the number of civilians killed has dropped , assassinations of juridical and legislative officials have increased and violence against Christians in Nineveh province has stirred concern . The report raises fears that the mishandling of key political efforts in the country could reverse gains . Crucial efforts include the upcoming provincial elections , resolving disputes over areas such as Kirkuk city ; resettling displaced people ; and providing permanent employment for the Sons of Iraq , the largely Sunni U.S.-backed security personnel .
Pentagon report assesses progress in Iraq from September to November . Iran `` continues to ... oppose ... a fully secure and stable Iraq '' by supporting militants . The United States has not yet decided whether it will continue its military presence after the end of 2011, but is considering options for continuing support if conditions are right. `` Iraq remains fragile because ... power brokers do n't share a unified national vision ''