LONDON (Agencies) - British Prime Minister Gordon Brown voiced opposition Friday to US strikes against what he called militants in Pakistan but said the two sides were close to reaching a deal on the issue. Brown, who met new Pakistani President Asif Ali Zardari in London this week, was asked about drones apparently operated by the United States striking targets in the tribal border areas. In an interview with Sky News TV channel, Brown, "We've made it absolutely clear that that is not what we would do, what I'm saying to you is that I believe America and Pakistan will reach an agreement about the best way forward on this." He added: "We of course respect the territorial integrity of Pakistan. I think they're coming close to an agreement about what the right thing to do is". In private, US officials claim Pakistan is doing too little to flush out the militants linked to deadly attacks on NATO troops in Afghanistan. Meanwhile, US Defence Secretary Robert Gates said he had notified the Nato allies that they will be expected to share the cost of a planned expansion of the Afghan national army. Speaking at the conclusion of a meeting of the alliance in London, Gates said he told his colleagues of "the importance of sharing the cost of the increased size of the Afghan army." The army is to grow from the current 80,000 soldiers to 134,000. The idea is to build a security force that can stand on its own. "Turning security responsibilities over to the Afghans themselves at some future date is really the goal that we all have in mind and we need to be prepared to share the cost" of getting to that point, he said. Earlier Friday, Gates participated in a Nato defence ministers meeting that focused on pushing forward with long-stalled plans to improve the alliance's ability to better use military forces. The talks produced no new agreements but were intended to pave the way for decisions next spring. Meanwhile, Nato Secretary-General Jaap de Hoop Scheffer said he'll continue to press allies to boost their troop numbers in Afghanistan to help fight an increasingly complex insurgency, according to Bloomberg TV. "We can't just rely on the US," De Hoop Scheffer told reporters after a meeting of allied defence ministers in London on Friday. "My job is to gain as much solidarity as possible and so I will go on nagging them to get more forces on the ground." At the same time, De Hoop Scheffer stressed the North Atlantic Treaty Organisation isn't waging a war in Afghanistan which can be won militarily, and that good governance and political dialogue with neighbouring countries such as Pakistan are equally important. Britain, Europe's biggest contributor to the Afghan war, plans to send "a few hundred" extra troops, bringing the UK contingent to about 8,100 as of October, Defence Secretary Des Browne said. "We need deeper commitment from across Europe," Browne told BBC Radio 4 today. "It is not just about sending troops, it is about abilities, equipment and support so that they can carry out our operations better." De Hoop Scheffer said he will make proposals for getting more helicopters into the war zone when defence ministers meet again next month in Budapest. "We're not doing well," he said. "I'm not beating around the bush here." Military commanders are pointing to tribal regions between Pakistan and Afghanistan as a safe haven for Al-Qaeda and Taliban fighters who fled to the mountainous terrain in 2001. De Hoop Scheffer spoke of the need to "to beef up political dialogue with Pakistan." Yesterday, he said he hoped the Sept 6 election of Pakistani President Asif Ali Zardari would provide an opportunity to devise a new approach for quelling border unrest. Nato may "step up" its planning and training to defend the 26-nation bloc's territory, the alliance's head said Friday, amid tensions between the West and Moscow over the recent Georgia-Russia conflict. But speaking in London after a meeting of Nato defence ministers, Jaap de Hoop Scheffer said there was no reason for alarm. The Nato ministers including US Defence Secretary Robert Gates "concluded that planning and training for collective defence of Nato territory is what this alliance has done for 60 years," he said. "We may step up some elements here or there," he told reporters, before adding that "planning and training for collective defence is, for Nato ... business as usual."