The opposition Puea Thai Party on Friday called for Foreign Minister Kasit Piromya and Kamrob Palawatwichai, former first secretary to the Thai embassy in Phnom Penh, and accept responsibility for having caused Sivarak Chutipong's suffering in Cambodia.
The call was made in a letter submitted by party spokesman Prompong Nopparit. The letter was accepted by Seri Mutthatharn, deputy director of the General Affairs Division.
Sivarak was sentenced to seven years in jail and a fine of about 82,500 baht by a Cambodian court which found him guilty of supplying information on former Thai prime minister Thaksin Shinawatra's flight schedule to the Thai government through Mr Kamrob.
Mr Prompong also accused the government to having impeded the Puea Thai Party's attempt to get a royal pardon for Sivarak. He said Prime Minister Abhisit Vejjajiva and his aides had continued to make remarks that might be construed as infringing on Cambodia's sovereignty.
Earlier today, he went to the Education Ministry to submit a leave request of Simarak na Nakhon Phanom, Sivarak's mother, to Education Minister Jurin Laksanavisit. Mrs Simarak said it was necessary for her to remain in Phnom Penh to prepare documents to petition for the royal pardon.