NEW YORK - The British ambassador to Afghanistan believes the US strategy there is failing, NATO reinforcements would be counterproductive and it would be better if an "acceptable dictator" came to power in Kabul in the next few years, according to The New York Times. The comments attributed to Sir Sherard Cowper-Coles were included in a diplomatic cable from a French diplomat in Kabul which was obtained by Le Canard Enchaine, a satirical magazine. Reporting on a meeting on September 2, French diplomat Jean-Francois Fitou quoted Sir Sherard as saying: "The American strategy is destined to fail. The coalition presence, particularly the military presence, is part of the problem, not the solution." More NATO troops would have "a perverse effect", the memo quotes him as saying. "It would identify us even more clearly as an occupying force." According to the published memo, he also says the elected Government of Hamid Karzai has lost all trust, and it would be a "positive thing" if in five to 10 years, after British troops have left, the country was governed by "an acceptable dictator". A British Foreign Office statement issued on Wednesday said: "It is not for us to comment on something presented as extracts from a French diplomatic telegram, but the views quoted are not an accurate representation of the British Government's approach. We work closely with our US allies in ... decision-making." The leaked memo has emerged at a time of deepening gloom over security in Afghanistan. UN Secretary-General Ban Ki-moon has said it has "deteriorated markedly" over the past six months and pointed to the increasing attacks on aid workers. At least 30 have been killed so far this year. The top US commander in Afghanistan, General David McKiernan, warned on Wednesday that militants were flooding into the country from across the Muslim world to join the Taliban's fight against the coalition, mostly via Pakistan. "They are very well trained. They are good at attacks on soft targets. They are Uzbeks, Chechens, Punjabis, Arabic, Europeans," he said. Welcoming recent changes at the top of Pakistan's Inter-Services Intelligence agency, he described the agency as "historically and institutionally complicit" in Taliban activities in Pakistan's tribal areas. General McKiernan confirmed he was seeking an additional three US combat brigades " about 10,500 soldiers " to reinforce the 40-country NATO mission as soon as possible.