Russian President Dmitri Medvedev and South Korean President Lee Myung-bak agreed in a telephone conversation to call for a strong reaction by the international community for North Korea's May 25 nuclear test, according to a spokesman for the South Korean president's office, Yonhap reported May 27. Lee asked Medvedev to take a special interest in the issue to ensure the U.N. Security Council is able to respond quickly and strongly.