Senior diplomats from the two Koreas and the United States will convene in New York Tuesday for a seminar on finding solutions to North Korea's nuclear standoff.

The closed-door seminar will be attended by Li Gun, deputy director general of the North Korean Foreign Ministry's American Affairs Bureau and South Korea's Ambassador to Washington, Han Sung-joo. The United States will be represented by Joseph DeTrani, the U.S. State Department's Special Envoy on Korean Peninsula Affairs.

The seminar was organized by the National Committee on American Foreign Policy, a New York-based private think tank.

According to a source in the U.N., no new proposals are expected from the seminar with the three countries, essentially reconfirming their previous stances on the North's nuclear impasse.

At the last round of six-way nuclear talks, North Korea proposed freezing its nuclear arms program and pledged to stop building, testing and proliferating atomic weapons, on the condition that the United States compensate it for the freeze.

The U.S., for its part, presented an offer that calls for a step-by-step dismantling of Pyongyang's plutonium and alleged uranium weapons programs in return for aid and security guarantees and an easing of its political and economic isolation.