Bahrain's King Hamad bin Issa Al Khalifa approved a monetary union agreement that will pave the way for the launch of a single currency among four Gulf Arab states, state-run Bahrain News Agency (BNA) reported Thursday. King Khalifa issued a decree on the union, after it was ratified by the Council of Representatives and the Shuaa Council, BNA said. The Kuwaiti parliament ratified the agreement earlier this week, but the country's Foreign Minister Sheik Mohammad Al Sabah said the adoption of a currency may take up to 10 years. Meanwhile, Kuwait will seek the return of the UAE and Oman to the Gulf Arab unified currency plan, the official KUNA news agency reported on Friday citing the country's finance minister. “This would strengthen the economies of the region and turn it into an economic bloc of [importance] that would be taken into consideration globally,” said Mustapha Al-Shamali. In May, the UAE broke ranks with four other Gulf Arab states by withdrawing from the single currency plan in protest at a decision to base the joint central bank in Saudi Arabia, the largest Arab economy. Oman opted out of the monetary union in 2006 and the GCC has since acknowledged it would miss the 2010 single currency deadline. Kuwait will work toward bringing back the two countries through its presidency of the Gulf Cooperation Council and its summit set for Dec. 14-16, Shamali said without giving details. In 2001, the six members of the GCC had agreed to set up a monetary union in the world's top oil exporting region like that of the European Union. The GCC is a loose economic and political alliance that also includes Bahrain and Qatar. Members rotate the presidency of the group annually. The UAE said in May that it would consider rejoining the monetary union if the terms change and its neighbors agree to allow a joint central bank to be based in the country. Five of the six nations peg their currencies to the US dollar but a range of technical issues such as harmonization of banking regulations remain to be tackled in order for them to share a new currency, which is seen raising the bloc's economic weight as well as reducing costs for businesses.