South Korea’s top nuclear envoy raised concerns about North Korea’s recent activity at its Punggye-ri nuclear testing site with his Chinese counterpart and urged Beijing to play a “constructive role” in bringing Pyongyang back to the dialogue table, Seoul’s foreign ministry said on Tuesday.

Noh Kyu-duk shared the sentiments with Liu Xiaoming, China’s Korea Peninsula policy representative, as Liu visits Seoul as part of what appears to be a diplomatic outreach campaign following North Korea’s missile intercontinental ballistic missile (ICBM) in March.