Australia's relations with other countries fall directly under the subject of external affairs. It includes relations with other British Dominions and further extends to relations with international organisations. The pursuit and advancement of friendliness with foreign governments is another vital aspect under the external affairs power. The High Court has held that the power covers the regulation of conduct that takes place outside Australia, suggesting that mere externality to Australia could enliven the power. In particular, Commonwealth legislation of 1998 that retroactively criminalised war crimes committed during World War II in Europe by Australian citizens was held a valid exercise of the external affairs power.