Asian Military Buildup to fight... who?

The underlined words worries me. Who is it?

Australian Military Buildup And The Rise Of Asian NATO

On March 2, 2009 the Australian Department of Defence released a 140-page white paper called Defending Australia in the Asia Pacific century: force 2030 (1), which announced $72 billion in new military spending for an island nation of barely 20 million inhabitants with no adversaries except those it chooses to make for itself.