UN military action against Libyan leader Muammar Gaddafi has echoed the use of international force against Iraq under Saddam Hussein, but for the oil market the implications are very different.
A look at some of the issues at stake:
Effect on oil prices
Oil prices briefly spiked to a high of $39.99 before the US-led invasion of Iraq in 2003 and then dropped back.
After Iraq's invasion of Kuwait in August 1990, US crude climbed above $40 in October of that year and was falling by the time of the intervention of UN forces in January-February 1991, which ended the occupation.
Concern about the loss of oil from OPEC member Libya and the possibility of unrest across the Middle East drove Brent futures to a two-and-a-half year of nearly $120 last month.
They remain around $115, but analysts said the mood was cautious as traders tackled extreme levels of uncertainty.
Image: A Filipino activist wearing a mask to represent the US as a warmonger during a rally condeming the continued strikes by the US, Europe and other countries on Libya.