[Targan]

I disagree. There is no way Australia would stand back and let Indonesia invade Papua New Guinea.

Australia failed to stop the Indonesians from annexing East Timor and West Irian during the 1970s largely because of the aftermath of the Vietnam War. Public sentiment was totally against going to war again so soon and the Australian military's morale had utterly collapsed. I wasn't even in Australia at the time and wasn't even in primary school yet but looking back at it I'm appalled and disgusted at Australia's lack of action against Indonesia during the early to mid 1970s.

Also, East Timor was a Portuguese holding and West Irian was formerly a Dutch holding. Paint it however you like, but PNG was a former Australian territory. In RL right now, if Indonesia made a land grab for PNG, there would be solid public support for the ADF to take action against the Indonesian military. Yes my view on these matters is coloured by my disdain towards the Indonesian government and military's past and most certainly present atrocities towards its ethnic minorities. I tell you what, if Indonesia invaded PNG and the Australian government didn't send in the ADF, I would donate my own money towards funding an anti-Indonesian insurgency.

Raellus, if you want a realistic trigger for Australia to go to war against Indonesia, in my opinion it would be the indigenous insurgency of West Papua ramping up their activities against the Indonesian police and military, perhaps due to an influx of funds and military equipment (from whatever source/s). It would really piss the Indonesians off if they thought the insurgents were launching raids from across the border with PNG, and if they demanded that the PNG government take action and they refused or dragged their feet, I think it would be realistic for the Indonesian military to commence cross-border operations.

I can also see the Indonesians being even bolder than usual if they thought that the ADF had its hands full elsewhere (say, supporting military operations in Korea).