For his part, Mr. Zardari, in an interview with the French newspaper Le Monde earlier this week, said the coalition forces, led by the United States and Britain, were losing the war in Afghanistan because of an overreliance on military action instead of economic development.

But when the two leaders spoke to reporters after two meetings the tone was one of amity and cooperation. Mr. Cameron invited Mr. Zardari to plant a sapling in the Chequers garden in memory of Mr. Zardari’s wife, Benazir Bhutto, a former prime minister of Pakistan who died during a suicide attack by Islamic militants in December 2007. He told reporters that he and Mr. Zardari had agreed to “deepen and enhance” the “unbreakable relationship” between Britain and Pakistan, “whether that is in trade, whether it’s in education, and also in the absolutely vital area of combating terrorism.”

Mr. Zardari said he was grateful to Mr. Cameron for “understanding the grievances and the problems we face in Pakistan,” and for Britain’s support, with nearly $16 million in emergency aid, for Pakistan’s flood victims. He added: “Storms will come and storms will go, and Pakistan and Britain will stand together and face all the difficulties with dignity, and we will make sure the world is a better place for our coming generations.”

Separately, Mr. Zardari told The Associated Press he was willing to consider negotiations with the Taliban in his country, despite the collapse of a deal his government made with the Taliban over control of the Swat Valley in northern Pakistan.