South Korea's Minister of Defense Kim Jang-Soo speaks during the "Nuclear Challenges" plenary session at the Shangri-La Dialogue security conference in Singapore June 2, 2007. Kim said on Saturday he expects North Korea to begin to close its nuclear reactor, the source of its weapons-grade plutonium, once $25 million in frozen funds in a Macau bank are freed up. REUTERS/Nicky Loh (SINGAPORE)