To Feanor and Swerve and answered in the lost logical order I can .
Do you honestly think modern day Russia, with it's hydro-carbon and near-abroad driven foreign policy is all that concerned over the DPRK?
You dont think that North Korea constitutes the near abroad? Or to put it another way, what are the two main complaints Russia has against the West? Well, encirclement and SDI (or whatever Strategic Missile Defence is called today).
How the do you think the Russian Govt views the current situation where a large and growing fleet of American, Japanese and South Korean Aegis Destroyers and Frigates, sporting their US supplied Anti Ballistic Missile systems, are sitting off its Eastern Coast, backed up with Land based systems on Japan and waiting to shoot down a North Korean Ballistic Missile for (one must suppose) the sole purpose of provoking this prickly little country into starting a war which if unopposed, would result in US occuaption of North Korea and the placement of not only US Land, Sea and Air forces close to the border, but plenty more Anti Missile Defence systems as well?
As for Russia - the border is of trivial length, and there already are Western forces on the maritime borders of the Russian Far East, so close to Russian territory that a small land border makes no real difference. Russia didn't go to war to stop Western forces being established on its European borders, which are many times more important, & far closer to its heartland.
But it is a border and right on the doorstep on the most strategically valuable part of its Far East Territory see also above and Feanors previous post.
If it could hand over N. Korea to the south, it would do it tomorrow - as long as the deal included the complete withdrawal of the USA from Korea.
In principle I agree, but if it were that simple in practice it would have happened years ago. Clearly there a significant lack of trust and that has implications for all possible scenarios. The fact that Emperor Hirohito surrendered sixty years ago, but US forces are still in Yokohama and Okinawa may have something to do with it.
I also think China seeks a united Korea which is completely free of US influence and that means one unified under its own preferred proxy.
China also shares Russias concerns on encirclement and SDI, add to this the relative proximity of Beijing, Dalian and many other major Northern cities to North Korean territory, you can understand its concern and hard stance. The
very high profile given to the DPRK Premier on his visit to China last week to celebrate 60 years of DPRK and PRC friendship and the launch of the China/North Korea year of special friendship should send out an unambigeous signal.
Ultimately though if the rosy situation described by Swerve was a reality, then how would North Korea have been able to get away with its behaviour for so long? It is simply because it knows that any attempt to attack it would drag in all the regional players and so it trades on it.
What though makes it so dangerous is that nobody really has a clue what is happening inside the North Korean elite, especially with Kim such a sick man. The phrase Mutually Assured Destruction does have a place here althouigh not in its usuall Nuclear context, but in its basic meaning as the response to Assured Destruction. If factions inside North Korea are feeling threatened by a succession struggle or if indeed the regime is close to collapse, then they frankly have nothing to lose from a conflagration. This means that with Japan and others having foolishly made the threat to intercept and North Korea responding that the attempt and not even a succesful intercept would be a Casus Belli, a North Korean General only has to claim that an Interception was attempted (and defeated by our nations Glorious soldiers etc..) in order to justify opening fire.
Bearing in mind all the above, especially the lack of trust between the two sides, once fighting does erupt the only logical solution is to comprehensively take control of the peninsular and destroy the enemies ability to prevent it - sadly its a cold and simple as that.
The real danger is that such a conflict can easily spread to Central Asia and the Caucuses......