Apparently you're a little behind on current events (20-40 years).
1. The Cold War ended. Russia has no ideological differences with South Korea.
No matter what ideological you have I don't care but the fact it is your Russia is close to Korean Peninsular and it may cause you to conflicts, it may not happen to day but tomorrow, nothing guaranteed 100%. I feel like you try to flatter the South Korean to bail for your interests or you are just a too innocent person!? Will the American let you have warm relationship with South Korean more than them, NO, beside the economic corporation, I don't think between Russia and South Korea can go further than that. The USA will try hard to break the relationship, if they can't they will kill South Korea pro-Russia forces event the president of South Korea, it is not too hard for the USA while the American absolutely dominated the vessels state. So don't think that you put down your communist status mean you are safe, the World still view your Russia as a bad guy and an aggressor to their peace. Just look what you have done with the East Europe and yesterday with Georgia. Who would believe your Russian? NO!!!
Furthermore, everybody knows your Ruskie democracy is just a fake, you still have dictatorship with only few powerful guys controlling of your whole country such as Putin or Medvedev. That's is why the West and USA have been using human rights, democracy, freedom of politic cards to against you just like they do with China. In my opinion, I do admire the Chinese more than you because they indeed have more democracy than your Russia, China in the outside looks like one party dictatorship but they are more flexible and realistic than any other political systems. China long blooding history has proved that they cannot growing well if they don't have democracy, so I don't think they choose the opposite approach to prevent themselves from development; China Communist Party just a dud, the Chinese do capitalism damn well more than you though.
2. Russia has nothing with North Korea. You have not heard nothing about a split in the socialist camp? North Korea is China's sphere of influence (and quite limited). For this reason, Russia is not involved in the conflict in South Korea and North Korea.
1-
it is irony when it coming out from a Russian about "socialist camp" it like a prostitute criticize others don't have virgins!? Your Russia is the most evil nation in the World even with your communist comrade, China. How did you treat your comrade, don't you remember?
2- "North Korea is China's sphere of influence" Yeah right, you just give a pure confession about how powerless your Russia today in the region, you really want too but your ability is "quite limited"! China never say that way because they don't think NK is a tool of them but a partner, a comrade in arms who are fighting for survive. Maybe Russia is too big and too "superpower" so everything will be concluded to a "sphere of influence"!?
3- "Russia is not involved in the conflict in South Korea and North Korea" ... Well I let you dream about the paradise relation between the Russia and South Korea, but I just remind you again that once the Korean Peninsular united and independent, nothing will worth both Russia and USA. For example: look at how Vietnam bite back at their comrade Chinese. If the Korean choose to go with the American then your Ruskie will be in huge of threat, that time maybe the world has a new conflict between too "old friends"
, however if the Korean choose the opposite way then USA will be frightened and will like a crazy beast, that time both of your Ruskie and Korean will loosing blood more than you could image ==> China & USA will be friend again to prevent the evil couple Korean and Ruskie!!! Worth for me either because we Cambodian have define that Chinese is our best ally, Chinese good we good
Last, I want you guys to know that the American is not as good as Chinese, just look how Chinese treat the Viets when the Viets bite back at their previous benefactor, nothing!? The American is absolutely different, when you betray them, you will pay hard!!!
3. Russia and Germany in the 20th century fought twice. This does not preclude establish good economic relations. Nothing prevents to establish mutually beneficial relations in South Korea and Russia.
Hello, economic corporation is a absolutely different, as I said above, even the Chinese have good economic relations with the West and USA more than your non-communist Russia! Do the Chinese and the West loving each others? NO!!!
Maybe I will surprise you. You also surprised me with a question.
I though you were more surprised than me, but anyways, you Russian are quite funny when dealing with others about politics. In the future when the Korean want to take some of their lands back from your Russia, don't blackmail them using your fancy Tu-95 flying over Korean penisular.
This is a strange comment since there is little to no chance of a war between Russia and the US. Russia isn't a threat to anyone unless you happen to be a Georgian.
A little known secret. Korean troops train in Russian Far East and there was once a talk of leasing a base in Russian Far East, which made Kim Jong Il go ballistic because of a possibility that ROK troops would invade from NK-Russian border in the event of a war.
The USA will "love" you very much if you are a new president of South Korea
I think what you said above is just because the Ruskie want to do something blackmail the NK, Russian indeed is doing great in this business, they use you as a chest for their political issues, they want to pressure the NK, in fact NK do have some border disputes with Russia these days, Russian are also want to have more influence with the North, but over than that, the Ruskie needs NK survive so they can stay away from the U.S. threat more than they need your SK.
SK is done, you can run nowhere, you are stuck hard with the USA, you live or die depend on them so make sure you don't make them unhappy.
Just because of some minor interests the Ruskie will scarify its national security to the USA and have to trust and love South Korean because these people are cute and lovely to Russia, from that the Yank will love Ruskie more because the friendly attitude the Ruskie offer to her vessel state in East Asia, Korea!? 
