What would happen if 3rdWorldWar starts b/w China and its neighboring countries

As I write in past blog about so history in that blog I was actually trying to write about the title provided in this blog but I couldn't write about future without scratching a little past.
As I wrote China can't be trusted even by it's allied nations as taking example of India and China's hostility towards it in the 60's.
China have always been hungry for territory and it doesn't know how to share.
In near future it could be possible that if China starts a war toward any neighboring country than other neighboring countries will come to support and start that attack on China from their boarder. China is definitely capable of taking care of large no. of enemy but if China fough against multiple countries that it's ​not only going to fight against that country but also the country which have agreed to help them in bad times thus resulting in making multiple enemy.
China will not only have to fight against other countries at the time of war but also have to fight against their own people in the country because of the current scenario and it's political corruption spread across the country. Besides that in Tibat, the remaining tibatian are also continuously trying to free their country from China and in the current scenario the People of Hong Kong are also trying to part away from China because China is sucking away all the hard earned money by Hong Kong and share among the corrupt government officials and don't do much for the people from that tax money.
Besides that in the area near Afghanistan where majority of the Chinese people's religion is islam they have face many harsh rules imposed by Chinese government to reduce the influence of Islamic religion which is making Chinese government unpopular among the people of that region.
Thus China will not only have to fight the enemy at the boarders but also within the boarder.
In those hard times it will be devastated for China to keep it's nation together and also fight foreign enemy.
In those times India will not seat quietly and will attack China and help the neighbouring countries as it have ties to almost all neighboring countries of China and also ask for assistance from other powerful nations which would be hard to ignore by any nation because of its current popularity in the United Nations and also it's ties with many Nations.
Thus it will be a devastated war because unlike in the past 2 world wars the Art of War have changed many folds not only the tactics have changed but today's cutting edge technology have made Lethal Weapons more devastated. All the countries know that and will use war as the last resort.
Thus world war 3 might not ever happen just remains cold war.
But still China is continuously experimenting by try to poke the bear and observe that how far they can go before it starts to attack.
China have came in near war situations for past year with Japan and USA and also South Korea and Taiwan etc.... The list goes on but still managed to stay away from firing missile on other Nations but I don't know for how long time will it be able to do that or other countries will tolerate China.
Only time will tell.