U.S. President Donald Trump and North Korea's leader Kim Jong Un shake hands during their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018.
Anthony Wallace | Pool | Reuters
Russian President Vladimir Putin asked North Korean official Kim Yong Nam at their meeting on Thursday to pass an invitation to visit Russia in September to North Korean leader Kim Jong Un.
Kim Yong Nam is head of the presidium of North Korea's Supreme People's Assembly.
Putin also said he welcomed the meeting between the North Korean leader and U.S. President Donald Trump.