MADRID (Reuters) - The US diplomat in charge of Afghanistan and Pakistan affairs said Washington accepted that a final political solution in Afghanistan could involve reformed Taliban in the government if certain red lines were respected. Richard Holbrooke said the peace jirga in Kabul, in which the Afghan President was given a mandate to negotiate with the insurgents, was an important step in efforts to reach out to the Taliban and said the US supported that effort. Asked whether that support extended to even top leaders, such as supreme leader Mullah Mohammad Omar, one of the worlds most wanted men, he told Reuters on Sunday: Let me be clear on one thing, everybody understands that this war will not end in a clear-cut military victory. Its not going to end on the deck of a battleship like World War Two, or Dayton, Ohio, like the Bosnian war. Its going to have some different ending from that, some form of political settlements are necessary ... you cant have a settlement with Al-Qaeda, you cant talk to them, you cant negotiate with them, its out of the question. But it is possible to talk to Taliban leaders. In Madrid for an international conference to discuss non-military ways to help end the Afghan conflict, Holbrooke said if a member of the Taliban repudiated Al-Qaeda, laid down his arms and worked within the political system to join the government, theres nothing wrong with that. The door is open and this jirga was a benchmark event on the road to the effort towards reconciliation, he said, but did not specifically mention the leadership. Holbrooke said the meeting on Monday of special representatives for Afghanistan and Pakistan, which would continue the discussion started in the jirga, was the biggest such gathering involving officials from more than 30 countries and organisations. He said the growing level of participation, particularly from the Islamic world, in the groups regular meetings was a stark contrast to the pretty messy situation inherited by the administration of President Barack Obama. I would like to say ... that in my own personal view President Obamas Cairo speech was a real breakthrough, and since then its been more and more productive to reach out to our friends (in the Islamic world), Holbrooke said. Holbrooke said it was understandable that after nine years, many people were frustrated with the lack of progress against the insurgency in Afghanistan, but argued with those who said the war was unwinnable. What do they mean by win? We dont use the word win, we use the word succeed, he said.