North Korean Officials Visit Vladivostok, Is Kim Jong-un Planning a Trip to Russia?

It appears that either Kim Jong-un is planning a trip to Russia or that his de facto Chief of Staff, Kim Chang-son is just checking in on the sanctions busting schemes they have with the Russians. Russian President Putin has offered to hold an Inter-Korean Summit in Vladivostok before:

A senior North Korean official has left for Vladivostok in Russia’s far east after ending his trip to Moscow in what’s seen as part of preparations for a possible visit there by the North’s leader Kim Jong-un. 
Kim Chang-son, the official with the North’s State Affairs Commission, was spotted at Sheremetyevo International Airport in the Russian capital city at around 2:45 p.m. Saturday (Russia time). 
He was in Moscow for five days. 

Escorted by two guards, he quickly went into the VIP section, while four others who appeared to be accompanying Kim entered the boarding gate. 
The Russian Aeroflot SU 1700 flight carrying Kim took off at 4:10 p.m. and was expected to land in Vladivostok early Sunday. 
The visit by Kim, known as leader Kim Jong-un’s de facto chief of staff, raised speculation that Pyongyang could be making preparations for leader Kim’s first trip to Russia since taking office. 

A vehicle possibly carrying Kim Chang-son was seen coming into the Kremlin every day from Wednesday to Friday, suggesting the official held talks with Russian counterparts over logistics and protocol.

Yonhap

You can read more at the link.