John Howard has made the first announcement that
Australia could go to war. It's likely that Australia will declare
that it has been attacked (under the ANZUS treaty, much as NATO has done),
and Howard would be more enthusiastic than many Europeans about committing
all the troops that can be raised to the war.
(Btw, what would be required to bring in conscription in Australia; would
it be a referendum or simply an act of Parliament?)