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North Korean leader Kim Jong-un has replied to a congratulatory message from Vietnam's President To Lam, pledging to deepen bilateral ties, Pyongyang's state media said Tuesday. Lam had sent a letter to Kim on Sept. 9 to mark the 78th anniversary of North Korea's founding. In his reply, sent Oct. 26, Kim thanked Lam for the "warm and sincere" message and expressed belief that the traditional friendly cooperative relations, which entered a new stage of development after their meeting in Pyongyang last October, would further expand and develop in line with the common interests of both peoples. He also wished Lam good health. Yonhap and Korea Times report the pledge, while KBS World notes Kim's emphasis on the relationship's new phase.