Lee also revealed that the two Koreas kept up negotiations for a possible summit even after Seoul effectively froze relations in 2010 following the sinking of a South Korean naval vessel.
Lee's 800-page memoir of his 2008-12 term in the Blue House is titled "President's Time" and will be published next week, although excerpts were leaked to the press today.
The two Koreas held an historic summit in 2000 and again in 2007, and Lee said it started exploring the possibility of a third when it sent a high-powered delegation to the funeral of former South Korean president Kim Dae-Jung in August, 2009.
"North Korea demanded USD 10 billion dollars to fund the establishment of a national development bank," Lee wrote in his book.
That was on top of a demand for 100,000 tonnes of corn, 400,000 tonnes of rice, 300,000 tonnes of fertiliser, and asphalt pitch worth USD 100 million.
"It was absurd for the North to call for assistance to help sweeten the atmosphere," Lee wrote.
The negotiations took place amid heightened tensions over the North's nuclear weapons programme. Following a long-range missile test in April 2009, Pyongyang carried out its second nuclear test a month later.
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