In what came to be known as the Thule incident, an American bomber crashed in Greenland, spreading radioactive wreckage across 3 square miles of a frozen fjord. Denmark was not happy.
Canberra's attitude to nuclear weapons has always been riddled with contradictions. Homegrown nuclear campaigners winning the Nobel prize have put the cat among the pigeons.
Want to know if a rogue state has performed a nuclear test? Sniffer planes can help.