Sihasak revealed that the United Nations Security Council (UNSC) has not yet convened a meeting regarding the border dispute after Thailand sent a letter opposing Cambodia's call for a ceasefire. He emphasized Thailand's clear stance that Cambodia must stop firing first. China has clarified that the missiles are old and were not supplied to Cambodia anew.
On 16 Dec 2025 GMT+7 at the Government House, Sihasak Puangketkaew, Minister of Foreign Affairs, was interviewed about Thailand sending a letter to the UN Secretary-General and the UNSC President protesting Cambodia over the Thailand-Cambodia border situation. He said the letter was in response to Cambodia having sent a letter first. Currently, the UNSC meeting has not seen the necessity to hold a special session on the Thailand-Cambodia situation because it is not yet at a level requiring such a meeting. Following this, ASEAN foreign ministers will hold a special meeting on the Thailand-Cambodia situation on 22 Dec 2025 GMT+7.
When asked about China's stance on the matter, Sihasak said that on 15 Dec 2025 GMT+7, the Permanent Secretary of the Ministry of Foreign Affairs spoke with the Chinese Ambassador. China expressed a desire for Thailand and Cambodia to achieve peace and to resolve their problems. Thailand is ready, but both sides must agree. Although ceasefire talks are possible, firing was still observed the next day. Thailand's position is clear: if there is to be a ceasefire, Cambodia must be the first to stop shooting before discussions about the process can proceed.
Regarding the missiles seized near Hill 500, which are modern and Chinese-made, Sihasak said that China has clarified the weapons given to Cambodia are old. China confirmed they did not deliver new arms. There may be various ways these weapons were obtained, as there is a general market. Thailand will closely monitor this because Cambodia's use of heavy Chinese weapons to attack Thai territory caused damage and civilian deaths, necessitating ongoing talks with China.
On reports of mercenaries assisting Cambodia, Sihasak stated there has been no official report on this matter yet.
Regarding clarity on discussions with U.S. President Donald Trump, who has made statements differing from Thailand’s position, Sihasak confirmed there were definitely no talks about a ceasefire. Thailand insists a ceasefire can only happen if Cambodia stops firing first. The idea that the U.S. would unilaterally announce a ceasefire without Thailand's involvement is impossible. A ceasefire requires discussion on timing, procedures, and verification, and that point has not been reached. It is impossible to suddenly declare a ceasefire by 22:00. On the matter of U.S. tariffs, progress is expected to continue through telephone discussions. Statements about suspending or continuing tariff negotiations remain unclear.