* U.S. sees a resilient insurgency in Afghanistan
* Corruption remains a major problem
* Iran seen supporting Taliban with weapons, training (Adds additional findings)
WASHINGTON, Nov 23 (Reuters) - Violence in Afghanistan hit an all-time high in recent months and the insurgency is growing more sophisticated, the U.S. military said on Tuesday.
As security deteriorates after nine years of war, the Pentagon said violent incidents in Afghanistan had increased from April through the end of September -- up 300 percent from 2007 -- except for the use of roadside bombs.
While Western leaders look for signs of progress, the military noted in a periodic report to Congress that insurgents' geographic reach and sophistication had grown even as it said security was slowly spreading across the country.
The report also found that Iran continued to provide weapons and training to the Taliban and that their safe havens along the Afghanistan-Pakistan border remained an obstacle even as Pakistani military cooperation with NATO improved.
The Pentagon also said that while the Afghan government was making some efforts to combat corruption, there was a "questionable" commitment to ending impunity and prosecuting corrupt officials. (Reporting by Missy Ryan; Editing by Sandra Maler)
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