A senior Chinese official is due in Seoul next Sunday for high-level bilateral strategic talks, sources said Wednesday. Yang Jiechi, China's state councilor who handles foreign affairs, is expected to arrive on Sunday for a three-day visit, Yonhap reported. The visit had been anticipated as a follow-up to the South Korea-China summit agreement in June to establish a dialogue channel on security issues. Yang is expected to meet with Kim Jang-soo, chief presidential national security advisor, and discuss regional issues including North Korea's nuclear threats and Japan's rightward policy moves.