Should North Korea declare on South Korea?

South Korea should not declare war on North Korea

South Korea should not declare war on North Korea because North Korea has China as it's ally.
North Korea shares its border with China and that means the Chinese soldiers will get to North Korea in no time. Even though South Korea is an ally of the United States, it will still take a while for enough American troops to get over to South Korea to take on the North Koreans and Chinese. South Korean President, Lee Myung-bak said, "(We) will take resolute countermeasures against North Korea and make it admit its wrongdoings through strong international cooperation and return to the international community as a responsible member." It sounds like war is an option against North Korea. Declaring war against North Korea is a pretty dumb choice.