Qatari Emir Tamim bin Hamad al-Thani (center) at the Gulf Cooperation Council (GCC) Summit in Manama, Bahrain on December 6, 2016 (Photo:AFP/VNA)

The move is the first optimistic sign of resolving the Persian Gulf diplomatic tension over the past 6 months.

Established in 1981, GCC is a political and economic union consisting of Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the United Arab Emirates.