Cambodia went back to the court in 2011, following several clashes between its army and Thai forces that killed about 20 people and displaced thousands. The court reaffirmed the ruling in Cambodia's favor in 2013. Cambodia has again turned to the international court to resolve the border disputes but Thailand has rejected the court's jurisdiction.

At least a dozen people were killed after the two countries exchanged fire after simmering tensions over a border dispute boiled over on Thursday.

Clashes between Thai and Cambodian troops at their disputed border have killed at least 12 people, Thai authorities say. The fighting marks an escalation of a dispute between the two South East Asian neighbours that dates back more than a century.