''An administration headed by the DPJ will demand the United States seriously consider withdrawing marines from Okinawa,'' Kan writes in the Monthly Gendai, suggesting that they be moved to Hawaii or Saipan in the Pacific.

He also calls on Japan to break with what he terms the ''secret pact-based diplomacy'' of its postwar no-nuclear weapons principles. Specifically, Kan advocates distinguishing between the introduction and deployment of nuclear weapons and port calls by nuclear-armed U.S. warships and submarines.

Such calls should be exempt from a bilateral agreement that requires Japanese and U.S. officials to hold talks before they are made, he adds.

The talks have rarely been held, and U.S. diplomatic archives show Japanese officials have tacitly allowed U.S. nuclear warships and submarines to dock at Japanese ports.

Kan adds Japan should establish a ''peace-cooperation force'' that participates in peacekeeping operations under U.N. command.

The essay is the second Kan has written as part of his efforts to propose concrete governance plans ahead of the Sept. 23 leadership election. In June, he published an essay in which he described his administrative and economic policies.

Kan will leave for Washington and Boston in mid-August to meet with officials of the George W. Bush administration and think-tank researchers, according to DPJ officials.