'Solve'? How? With permission of China? It will never happen.
For all Chinese members here. You should read the treaty carefully then you will know what will China do if US attack DPRK.
中华人民共和国和朝鲜民主主义人民共和国友好合作互助条约
The following facts you should also know:
1.China will not allow the country's security situation be threatened by any other countries.
2.The treaty between China and DPRK is still available and we will keep our words.
3.We will not interfere DPRK's domestic issues though there are problems.
4.Current situations in the peninsula mainly exist between DPRK and US.
5.US's intentions to create more chaos in the northeast Asia is to counter China and gain more benefits for its own. Further more, we can even see the groups which will benefit from the chaos.
6.It is not first time and will not be the last time that US claims it want to kill a country's leader. What a robbery mentality and uncivilized behavior.
7.China's solution to the peninsula is six- party talks.
8.DPRK is not Iraq or Lybia.
9.China is not same as the country of 67 years ago
Korean war 2.0? Only morons will provoke and ignite it.
I agree that China has a defensive treaty with DPRK that will expire in 2020. So they have to intervene when US attack DPRK. But I don't agree that they should hold their horse and avoid to interfere DPRK domestic issue, because DPRK has given China a lot of problem and give US and Japan an excuse to pool their military assets there.
Look at how Kim problem has given China a great disadvantage while give American a great deal of advantage to their rivalry. Do you know what it means that the US has an excuse to pool their military assets to the region?
Before that, you have to understand what is the biggest American disadvantaged toward China. It's the range. They need to bring their military assets from the American continents to the battlefield, and it's far. You shouldn't distracted with their Ranger, Marine, and CBG alone. They have not enough power to fight China. Not in China neighborhood while PLA can gather all their assets to the region faster. They have to bring the majority of their military assets to the conflict area. And guess what, that's a great weakness to them, because China can always disturb the transfer on the way, and use the time to destroy the American foothold before they can establish their position there. That's the principle of China's Access Denied Strategy.
Now, because of Kim, The US has an excuse the transfer their military assets to Korean Peninsula without China can interfere. So when they succeed, the majority of the US military assets will be there. Thus, when China and US have a conflict, you have to face against the full capability of US military asset in the region.
Well, you still have a chance to win, but it will be bloodbath for China, and has a chance to decrease your industrial, economy power back into stone age. Because your A2D2 strategy has been failed.
So if you don't want to be a poor China guy again, you have to thwart the US strategy to gather their military assets in the Korean Peninsula. The question is how. But everyone know the reason. It's Kim Jong Un with all his madness. I doubt that the American consider DPRK as a real threat. No, they don't. DPRK is just an excuse for them to establish their military assets in the region. Their target is always China.
I know this is a difficult problem for China to deal with. The best result should be the DPRK stop the development of nuclear and USA aircraft carrier leave away. But we could achieve the goal because China has no ability to persuade Kim Jun un to give up the nuclear weapon. If DPRK insists on owning nuclear weapons, there is a chain reaction that ROK and Japan also want to have nuclear weapons. At last, there are going to be full of nuclear bombs in east asian area. And that situation is definitely unacceptable by China ,Russia and USA. Now China is in a hard dilemma.
Instead of being surrounded by nuclear weapons, China will choose a de-nuclearize DPRK.
When it comes to USA's surrounding China, there are lots of US military bases on Japan, ROK, Australia and south asia. DPRK as a very small country having a short defense deep is really not important to China's defense.
And there will never be a large-scale ground war between two nuclear powers.
China's epicentre locates at its southeast part which is the most developed area of the country . Taiwan is attached to it and people of Taiwan is 100% Chinese. China has not yet been unified with Taiwan till now. How could anybody come up with the idea that we will fight against US for a fat korean?
As i have said on another post, if there is a conflict between China and US, it could only be caused by Taiwan and occur on sea.
What we really concern about North Korea is a huge wave of refugees and lost of nuclear material when the DPRK regime collapses.
I think the real problem here is Kim Jong Un. He's mad. He's also disrespected to China. Just look at him, he never officially visit China since he becomes the Chairman of DPRK. KJU also give China some disadvantage in her grand strategy against American Pivots for some occasion. Because of his nuclear program, USA and Japan got their excuse to pool their military assets to Korean Peninsula. So I agree, Kim Jong Un must be dethroned.
If it does happen forget about Syria, the world will be focusing on a possible nuclear explosion. 
Tighten your seat belt
