
Suthep said Cambodia might have received incorrect information from ousted prime minister Thaksin Shinawatra.
Suthep was responding Hun Sen's staements which accused Thailand of preparing a coup against his government.
Hun Sen was quoted by the Agence France Presse during a speech at a provincial ceremony on Thursday, saying he had seen a secret Thai government document outlining the plan to mount a coup.
"You have outlined bad scenarios, including preparing to wage war against Cambodia," Hun Sen said.
Suthep insisted the Thai government has never thought of intervention in Cambodian politics and the Thai Prime Minister Abhisit Vejjajiva is a democracy champion who will never bend on destroying the neighbouring country through other means.
The information Cambodia received from Thaksin and opposition Puea Thai MP Jatuporn Promphan is incorrect and might have misled the Cambodian leader.
Foreign Ministry on Thursday lodged a complaint with police, charging key leaders of the anti-government United Front for Democracy Against Dictatorship (UDD) with publicising confidential documents and libel following a leak of the ministry's classified document on relations between Thailand and Cambodia.
The Thai Foreign Ministry will clarify the matter, Mr Suthep said, it is not necessary at this stage to reinforce troops along the border as the conflict between the two neighbouring countries is likely to end soon.
Suthep has just returned from his trip to Indonesia and discussed with Indonesian President Susilo Bambang Yudhoyono over rubber prices in the commodity market and other mutual interests.