ISLAMABAD Chairman US Joint Chiefs of Staff (CJCS), Admiral Michael G Mullen on Wednesday called on separately Chief of Army Staff, General Ashfaq Parvez Kayani, and Chairman Joint Chiefs of Staff Committee (CJCSC), General Khalid Shameem Wynne and discussed various issues including development in Afghanistan. According to informed sources, PAK-US military leaders discussed professional matters, the current defence cooperation and regional security environment with special emphasis on developments in Afghanistan. Agencies add: During the meeting, Admiral Mullen said that Pakistan paid a heavy price in war against terrorism, adding that US will keep on supporting Pakistan in its concerted efforts to wipe out militancy, the sources said. It has also been learnt that drone attacks issue also came under discussion in which Mullen was asked to halt them immediately. The US admiral reiterated that the US respects Pakistans sovereignty. It is a real critical piece of the overall strategy in Afghanistan and Pakistan and it is going to continue to be, he said, according to sources. On Tuesday, Mullen told reporters that the US military relationship with Pakistan is much improved, but there are still major disagreements. He said the safe havens issue is crucial, and that Pakistan knows the US view. However, he said any decision on operation in North Waziristan Agency will be taken solely by Pakistan. Its a real critical piece of the overall strategy in Afghanistan and Pakistan and its going to continue to be, Mullen said. Mullen also endorsed talks with Taliban. Ultimately we will have to talk to moderate Taliban, he said, adding that war has definitely weakened Taliban network. One significant challenge is simply defining mutual interests and objectives, the chairman said on the plane trip here. The best way I know how to do that is an individual meeting, he said.