DOHA (Al Jazeera) — On a visit to Doha, American special envoy Brian Hook says Qatar blockade continues to “harm shared regional interests”.

US Special Representative Brian Hook on Sunday acknowledged the challenge ahead of ending the crisis that has torn apart the Gulf Cooperation Council (GCC) — with the United Arab Emirates (UAE), Saudi Arabia, and Bahrain part of the siege. Egypt also joined the blockade, which saw nations close their airspace and borders to Qatar in June 2017.

However, Kuwait and Oman, the two other nations in the GCC, have sought dialogue between the countries since, with Kuwait’s Emir Sheikh Sabah Al Ahmad Al Sabah leading those efforts.