Washington: The US-Pak ties have strained following the detention of American diplomat Raymond Davis in Lahore and the Abbottabad raid which killed Osama bin Laden, affecting the bilateral military cooperation, President Barack Obama has told the Congress.

"Bilaterally, the fallout of the raid resulting in the death of Osama bin Laden continued to complicate the United States-Pakistan relationship, further strained by a series of media reports based on alleged leaks from both the United States and Pakistan," Obama said in a new report to Congress on US operations in Pakistan and Afghanistan.

"The kidnapping of an American citizen United States Agency for International Development (USAID) contractor provided an avenue for cooperation between law enforcement authorities, but simultaneously added a new level of security concern to US partners working in Pakistan," Obama said.

The unclassified section of the report running into 25 pages has been obtained by a news agency.

"This report covers the period from January 1, 2011, through June 30, 2011. To the extent possible, the report also provides an assessment through August 31, 2011," Obama said.

Between April 1 and June 30 period, Obama said, the overall indicators and metrics against this objective declined.

"Pakistan's response to the raid against Osama bin Laden on May 2 strained military-to-military cooperation and collaboration between the US and Pakistan," he said.

"The continuation of the Pakistan-directed drawdown of the US military assistance effort dramatically reduced the US ability to support Pakistan's COIN and CT fight," Obama said referring to the decision of Pakistan to reduce the number of American troops and trainers inside the country after the Abbottabad raid in May.

"The security situation in the FATA (Federally Administered Tribal Areas) and KPk (Khaibar Pakhtoonwah) continued to deteriorate slowly during this reporting period (April 1 to June 30), while the returned focus of militant violence against government infrastructure targets demonstrated the resiliency of the insurgency and the non-permanent effects of Pakistani operations in key insurgent areas," Obama said.

The negative reaction to the bin Laden raid within Pakistan included unprecedented public and internal military criticism of the leadership of the Pakistani military.

As a result, the leadership of Pakistan's military and intelligence establishments focused a significant amount of time and effort on managing internal opinion during this reporting period, said the report.

The security situation in the FATA and KPk continued to slowly deteriorate as in the previous reporting period.

Operations in Mohmand settled into a largely static and defensive posture, but unlike previous reporting periods, as Pakistan's ground operations in Mohmand stalled, so too did opportunities for ISAF and ANSF cooperation and collaboration with the Pakistani military on future plans and troop movements, necessary for effective combined planning along the border.