Thailand ended a 25-year contract with Cambodia to jointly explore hydrocarbons in the Gulf of Thailand on Tuesday, Reuters reported the same day.
The move reportedly came despite Cambodia's insistence to see the entire term of the agreement through.
The termination had reportedly been anticipated for some time, and comes after armed clashes between the countries last year, according to the report.
Thai Prime Minister Anutin Charnvirakul denied clashes along the border were the reason to scrap the contract and described it as "part of his policy" amid what he termed was a lack of progress after 25 years.
Anutin had pledged to cancel the agreement as part of his election campaign which had him re-elected as premier.
Cambodia's Foreign Minister Prak Sokhonn conveyed disappointment over the move, Reuters said.
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