World War 3 ?

This past two weeks, North Korea has attacked the south with over 40 artillery shells wich destroyed many infrastructures , the north Koreans say that the south has been training with on going military exercises in the sea between the two borders , fearing that the south may attack, wich triggered the bombing.
The blame has been put on the north , since were responsible for the sinking of the south Korean ship.
The south may never know when the north will stike again, and in the past couple of days they have been preparing them self incase of another attack, and if that happen , there could be a new war, a bigger and more worser then the the first, and many countries like Japan. U.S will be implacated in this.
Since the U.S military is stationed in the south, they both have been traning together and over 30 000 U.S soldiers are in the south, wich the Koreans consider them as a threat. Because China is an allie to the north, many say that China will be on the north Korean side, wich many others have been trying to prevent that.
In my opinion, i think that the south should stop it's military training, because that would help and it would also minimize the problems. I want them to have a peace treaty to prevent the bad from happening, and China has the right to help the north, because what the media is saying, are all lies.