As the name suggests, Muay Thai is the national sport of Thailand. But Cambodia has maintained that the sport traces its origins to the country’s own martial art, Kun Khmer.

As the host of this year’s Southeast Asian Games, scheduled to take place in May, Cambodia changed the name of the Muay Thai event to Kun Khmer.

In response, Thailand does not plan to send Muay Thai competitors to the tournament. Cambodia, meanwhile, has no intention to change its decision.

“According to the rules, if there are four or more participating countries, (Kun Khmer) is eligible for the games,” Vath Chamroeun, secretary-general of the Cambodian Southeast Asian Games Organising Committee, said in an article published by The Phnom Penh Post.

Vath Chamroeun added that Cambodia would retaliate by not sending kickboxers to the 2025 Southeast Asian Games, to be held in Thailand. The tournament takes place every two years with hosts changing on a rotating basis.

Tensions between Thailand and Cambodia erupted into armed conflict in 2008 over disagreements about which nation administers the Preah Vihear Temple, a Unesco World Heritage Site located near the border between the two countries.