OLLy, you say we need more immigration so we have expendables. How can we defeat an ememy,if they have been allowed to enter the country by the multitude. Plus why would the enemy worry about attacking the country when they can just apply to enter as immigrants or refugees and take over?

Gibo,
I not sure about a Russian/ Chinese alliance. I believe the Chinese see Russia as an enemy.
Where the Chinese are a concern is economically. Their economy is thriving. Most goods sold in Australia and in the Western World are manufactured in China. Look at our clothing and most electrical goods. We buy all our stuff from China because it can be made cheaply. The Chinese are already making low cost cars for export (Although they are not in Australia yet to my knowledge). Eventually, only the Chinese will have the technology, and they can start putting the prices up. The Chinese invasion you talk about may not be a conventional invasion, maybe their weapon of war will be their money, and they will simply buy us.