ISLAMABAD: US Secretary of State John Kerry and his Pakistani counterpart, Sartaj Aziz, said Thursday that the two countries will resume high-level negotiations over security issues.

Kerry also said he had invited Prime Minister Nawaz Sharif to come to Washington to meet with President Barack Obama.

''I'm pleased to announce that today, very quickly, we were able to agree to a resumption of the strategic dialogue in order to foster a deeper, broader and more comprehensive partnership between our countries,'' Kerry said at a press conference with Aziz in Islamabad.

He was speaking to media representatives after holding meetings with Prime Minister Sharif at the latter's residence and with a team led by Aziz at the Foreign Office. The US secretary of state also held a meeting with army chief General Ashfaq Kayani.

He said the talks will cover ''all of the key issues between us, from border management to counterterrorism to promoting US private investment and to Pakistan's own journey to economic revitalisation.''

The US and Pakistan launched high-level talks on a wide swath of security and development programs in 2010. But the talks stalled in November 2011 after US airstrikes on a Pakistani post on the Pak-Afghan border killed 24 Pakistani soldiers.

Even before that, the bilateral relationship was severely damaged by a variety of incidents, including a CIA contractor shooting to death two Pakistanis in Lahore and the covert US raid that killed Osama bin Laden in Abbottabad.

The resumption of the strategic dialogue indicates that the relationship between the two countries has improved since that low point. But there is still significant tension and mistrust between the two countries, especially regarding US drone strikes and Pakistan's alleged ties with the militants using its territory to launch cross-border attacks against American troops in Afghanistan.

''It is also no secret that along this journey in the last few years we've experienced a few differences,'' Kerry said.

''I think we came here today, both the prime minister and myself, with a committment that we cannot allow events that might divide us in a small way to distract from the common values and the common interests that unite us in big ways.''

Kerry was also asked about progress on a bilateral security agreement with Afghanistan that would keep some US forces in that country after 2014.

''I am personally confident that we will have an agreement, and the agreement will be timely,'' he replied.

''And I am confident that the president has ample space here within which to make any decisions he wants to make regarding future troop levels.''

While this is Kerry's first visit to Islamabad as secretary of state, he has a long history of dealing with Pakistan as former chairman of the Senate Foreign Relations Committee.

Sharif described him as ''a wonderful friend,'' and Kerry said, ''I have had the pleasure of visiting (Sharif's) home and having a number of meals with him.''

Before heading into a closed-door meeting, Sharif asked Kerry about his wife, Teresa Heinz Kerry, who was hospitalised after a seizure last month.

''She's doing better,'' Kerry said.

Sharif came to power in an election that marked the first time in Pakistan that a civilian government completed its full five-year term and transferred power in democratic elections. The country has a history of civilian leaders being overthrown in military coups.

''This is a historic transition that just took place,'' Kerry told US Embassy employees.

''Nobody should diminish it.''

Senior administration officials traveling with Kerry told reporters that while relations with Pakistan have grown touchy in recent years, there is the prospect of resetting those ties with Sharif's government and working together on major issues — counterterrorism, energy, regional stability, economic reforms, trade and investment. The officials spoke on condition of anonymity because they weren't authorised to publicly discuss Kerry's agenda.

The US also wants Pakistan to pressure leaders of the Afghan Taliban to negotiate with Afghan President Hamid Karzai's government, renounce violence and sever ties with Al Qaeda.

Officials in neighbouring Afghanistan are demanding that Pakistan dismantle extremists' havens inside the country and push the Taliban to join the peace process.

Both the US and Afghanistan say that if attacks are allowed to continue, the region will never become stable.

Pakistani officials say they do not control the Taliban, but Karzai's government isn't convinced.

Drone strikes are another point of contention.

Washington says it needs to attack dangerous militants with drones because Pakistan's government refuses to engage them militarily. Pakistan contends the drone strikes are a fresh violation of its sovereignty, and they have increased widespread anti-American sentiment in the country.

The United States has reduced the number of drone attacks against militants in Pakistan and limited strikes to top targets. There have been 16 drone strikes in Pakistan this year, compared with a peak of 122 in 2010, 73 in 2011 and 48 in 2012, according to the New America Foundation, a US-based think tank.

After Kerry wraps up his meetings in Islamabad, he is scheduled to fly to London. The State Department said he will meet there with United Arab Emirates Foreign Minister Abdullah bin Zayed Al-Nahyan to discuss Egypt, Syria and Middle East peace.