Kim Jong Un's visit to China will not have any major impact on the interests of the Russians. Russia is one of the major international players and is also an ally and trade partner with North Korea. Russia's main interest would be to see how Un and his regime acts towards ending their nuclear weapons program. They know how extreme the international sanctions are due to Un not wanting to get rid of his nuclear weapons program.
Russia and their interests in North Korea are strictly business in nature and Russian president Putin sees that if North Korea has the sanctions lifted a more accepted status in the international community will be afforded to Un and his country. This means that it could open up the door for more business for Russia. The only impact of Kim Jong Un and his visit to Beijing for the interests of Russia are strictly business and nothing else. Russia believes that the more trading partners of North Korea would open the door for more business and trading to be conducted for them.