Warning comes after Kim Yo-jong, the influential sister of North Korean leader Kim Jong-un, claims "dirty leaflets and things" discovered in border region
Kim's visit, prominently featuring a summit with Russian President Vladimir Putin on Wednesday, emphasizes the convergence of their interests amidst escalating conflicts with the West.
A Chinese delegation will visit Pyongyang to attend events to celebrate the 75th founding anniversary of the North Korean regime, state media said on Thursday