The "Arms Under Control" collective, which includes Amnesty International, Oxfam and Greenpeace, also called on Spain to stop exporting arms to the Saudi-led coalition fighting Iran-backed Houthi rebels in Yemen, where thousands of civilians have been killed.
France's Macron dines with Saudi crown prince on global tour
During his trip to Spain on Thursday, Prince Mohammed bin Salman will meet King Felipe VI and Prime Minister Mariano Rajoy -- "a meeting during which bilateral agreements will be signed," read the Spanish government's agenda, without giving more details.
Spain's loss-making shipyards are placing a lot of hope on the planned sale of five corvettes, which has reportedly been under negotiation for two years.
But rights groups have denounced it, saying the warships could be used in Saudi Arabia's military campaign in Yemen.
On Wednesday, the NGOs coalition asked the royal palace and Spanish government "not to promote the signature of Spanish company Navantia's contract to build five corvettes... for the Saudi army and to end arms exports to Saudi Arabia".
Pakistani flotilla takes part in 24 countries military drills in Saudi Arabia
It also called on Spain "to join a growing number of countries like Germany, Sweden, Norway or Belgium that have stopped exporting arms to the Saudi coalition" fighting in Yemen, which also includes countries like the United Arab Emirates.
The Saudi prince's trip to Spain will come hot on the heels of a three-day official visit to France and after a tour lasting several weeks of the United States, Britain and Egypt, where the self-styled moderniser signed multimillion-dollar deals.
Spain and Saudi Arabia's royal families are very close as King Felipe VI's father Juan Carlos was a close friend of the kingdom's late King Fahd, who reigned from 1982 to 2005, and is close to his brother King Salman.
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