WASHINGTON - The United States Tuesday urged Pakistan and India to have a "stable relationship", saying its military aid to Islamabad posed no threat to New Delhi. Washington also said that Pakistan was now taking "more effective action" to stamp out extremists within it borders, as it downplayed the leaked US military reports alleging links between ISI and militant groups. When an Indian correspondent asked how does the US make sure that its aid to Pakistan is not used for supporting terror across the border, State Department Spokesman Philip Crowley said, "A stable Pakistan is not a threat to India. A stable India does not need to be a threat to Pakistan. "In giving military assistance to Pakistan, we have systems of accountability to be sure that it is being employed in accordance with the agreements that we have with Pakistan," he said. "Where we have questions about the nature of Pakistani employment of US assistance, we raise those questions directly with the Pakistani Government. We have in the past and we will continue to do that." "So building up the capability of Pakistan to deal with the threat within its own borders should not be seen as a threat to India," Crowley said. Asked if the US had spoken to Pakistani Government about some Pakistani groups' role in Mumbai attacks since the leak of secret military documents, he said: "We have talked to Pakistan about our mutual concerns on terrorism many, many times going back months and years." Crowley said he could not say "that we've had a substantive conversation about this" since the leaks. "But there are concerns about making sure that Pakistan bring to justice those responsible for the Mumbai attack." Responding to a question about Tuesday's statement by Afghan National Security Council's chief accusing Pakistan of training militants while receiving billions in American aid, the spokesman said, "Pakistan has understood in recent months and years that the insurgents which have enjoyed safe haven within Pakistans border now are an existential threat to Pakistan. "And weve seen concerted action by Pakistan in recent months in Swat, South Waziristan and elsewhere, and our message to Pakistan is to continue on the offensive". The spokesman also said that the leaked documents were uncorroborated field reports. "Somebody talked to somebody and somebody wrote it down, sent it up the chain, and the information in these documents may or may not be true. As we said yesterday, notwithstanding our ongoing concern about the release of these documents to the extent they raise questions, certainly the relationship among Afghanistan, Pakistan, India, the tensions that have historically existed in the region, this is these are not this is not a startling revelation. Its been central to our revised strategy over the past year." Pressed further on the Afghan statement, Crowley said, "We dont look at Afghanistan in isolation. We look at Afghanistan in the context of other countries in the region. We have conversations with each of these countries. Each of these countries we consider to be strategic allies in a vitally important region of the world. One of the reasons why we, as the Secretary (of State Hillary Clinton) said last week pushed hard for the transit trade agreement between Afghanistan and Pakistan to try to change the basis of the relationship between two important allies of the United States. And that transit trade agreement does, in fact, have the potential ability to transform relationships with countries in the region. "So were very conscious of the history among these countries in the region. Weve worked hard to try to help each understand the interests and needs of the other. There is communication going on across these countries that we think is very important, very valuable not just to the United States, but there it is important for Afghanistan and Pakistan to have a stable relationship. They are going to remain neighbors in perpetuity. "So we are very, very conscious of the complexity that involves these overlapping relationships, and we've worked hard in our dialogue with each country to try to make this a more regional approach to a common challenge," he said noting there is communication going on across these countries that it thinks is very important, very valuable not just to the US, but also it is important for Afghanistan and Pakistan to have a stable relationship. "We have important national and global interests with each of these countries. Our support for Afghanistan is not taken from Pakistan. Our support for Pakistan does not mean a negative for India," he said. "It is vitally important that these countries develop reinforcing relationships; that's what we're trying to do. "That's why one of the fundamental changes in the strategy that the President approved last year was to make sure that we are looking at this in a regional rather than just an isolated issue. "So part of the solution to Afghanistan does, in fact, fall within the borders of Pakistan," he said. Responding to a question, Crowley said there are concerns about making sure that Pakistan bring to justice those responsible for the Mumbai attack. "We've had that conversation with Pakistan and India many, many times. Our concerns about elements within Pakistan and connections that those elements have with the Pakistani Government, we've had that conversation with Pakistan many times," he said.