The government has cited humanitarian reasons for allowing aircraft from Myanmar to land in Tak's Mae Sot district to pick up officials and their families fleeing Myawaddy after rebel forces seized control of the town.
Thanawat Sirikul, deputy spokesman of the Ministry of Foreign Affairs, said at a press briefing on Monday that the ministry had received a request from the Myanmar embassy in Thailand on Saturday for permission to allow three special flights from Yangon to Mae Sot from Sunday to Tuesday to evacuate Myanmar military officials and their families to safe areas.
"In light of the urgency of the situation, a decision was made at a government level to approve Myanmar's request on humanitarian grounds," said Mr Thanawat, also deputy director-general of the ministry's Department of Information.
He said the National Security Council had held a meeting with relevant agencies to discuss how to proceed with the matter.
"Thailand has been helping all parties in Myanmar in line with humanitarian principles. Security agencies in Thailand have clear guidelines for handling people seeking evacuation to Thailand and will not allow anyone to bring weapons across the border into Thailand," he said.
After receiving the Thai government's green light, an aircraft from Myanmar landed at Mae Sot airport on Sunday to airlift Myanmar officials and left Thailand the same day, Mr Thanawat said. He added that the Myanmar government later cancelled the remaining flights to Mae Sot originally scheduled for Monday and Tuesday.
"Currently, Thailand is monitoring the situation along the Thai-Myanmar border closely, especially in Myawaddy.
He added, "The government is ready to take any necessary action to ensure the peace and safety of local people along the border and protect Thailand's national interest."
He said that the government will hold a meeting at Government House to assess the situation in the neighbouring country and devise measures to address it.
The Myanmar government has sought permission for aircraft to land in Mae Sot district of Tak to pick up any officials and their dependents who flee Myawaddy, according to informed sources.
Prime Minister Srettha Thavisin said Monday that Deputy Foreign Minister Jakkapong Sangmanee told him that the Myanmar government sought permission in line with proper procedures.
It was a request for the transport of civilians, not the transport of military personnel or weapons, Mr Srettha said.
He said he will hold a meeting on Tuesday with Foreign Affairs Minister Parnpree Bahiddha-Nukara, the chief of the chief of the defence forces, the army chief and the Foreign Affairs Ministry's advisers to discuss ways to ensure cohesion in dealing with any impacts of the situation in Myanmar.
"The Thai government hopes that peace and unity will be restored in Myanmar so the country can enjoy growth and progress," the prime minister said.
"The government also attaches importance to human rights and people's safety," he added.
Sources said that the Myanmar government filed a request with the Thai Ministry of Foreign Affairs on Sunday evening for the Myanmar aircraft to land at Mae Sot airport.
The planes were to extract 617 soldiers and their families who may flee Myawaddy, which had been captured by rebel forces.
A Myanmar Airways ATR 72-600 aircraft landed in Mae Sot at 9.20pm on Sunday after it was reported that rebel troops were holding Myanmar officials and their families at Shwe Kokko. The plane departed, empty, an hour later.
The Myawaddy-Mae Sot border crossing was open as usual on Monday.
Maj Gen Narongrit Panikabut of the 4th Infantry Division confirmed on Monday that the Myanmar government had sought assistance in transporting vulnerable people and important documents from Myawaddy.
Meanwhile, Mr Jakkapong also posted on social media on Monday that Myanmar had sought permission to fly civilians and their belongings home.