Trying to unseat Gaddafi from afar
The war in Libya has renewed debate on whether a foreign country should intervene in another country's affairs.
The successful uprisings in Egypt and Tunisia that overthrew the countries' rulers last month inspired thousands of anti-government protesters in Libya to take to the streets. They want the country's longtime leader Colonel Muammar Gaddafi to step down.
Gaddafi has been in power for more than 40 years. He has mobilised his security forces to crack down on protesters. His army has used warplanes and snipers, killing hundreds of people, many of them civilians.
The United Nations Security Council authorised a US-led military campaign - which also includes Britain, France and Canada - to cripple Gaddafi's air defences and enforce a no-fly zone over Libya.
People worldwide have been debating the legality of foreign intervention in Libya.
Steve Chung Lok-wai, a research co-ordinator at the Chinese University's Hong Kong Institute of Asia-Pacific Studies, said events in the former in Yugoslavia in the 1990s changed the way countries deal with other countries' affairs.