Travellers walk at Don Mueang International Airport as the country reopens its borders to vaccinated tourists in Chiang Mai, Thailand November 23, 2021. Picture taken November 23, 2021. REUTERS/Soe Zeya Tun 

A family plays with an elephant at popular tourist destination Mae Sa Elephant Camp, as the country reopens its borders to vaccinated tourists in Chiang Mai, Thailand November 20, 2021. Picture taken November 20, 2021. REUTERS/Soe Zeya Tun 

A family plays with an elephant at popular tourist destination Mae Sa Elephant Camp, as the country reopens its borders to vaccinated tourists in Chiang Mai, Thailand November 20, 2021. Picture taken November 20, 2021. REUTERS/Soe Zeya Tun 

A woman sells live fish to release into a river during the Loy Krathong festival which is held as a symbolic apology to the goddess of the river in Chiang Mai, Thailand, November 19, 2021. REUTERS/Soe Zeya Tun 

People gather to place krathongs (floating baskets) into a river during the Loy Krathong festival which is held as a symbolic apology to the goddess of the river in Chiang Mai, Thailand, November 19, 2021. REUTERS/Soe Zeya Tun 

People take photos during the Loy Krathong festival which is held as a symbolic apology to the goddess of the river in Chiang Mai, Thailand, November 19, 2021. REUTERS/Soe Zeya Tun 

People take photos during the Loy Krathong festival which is held as a symbolic apology to the goddess of the river in Chiang Mai, Thailand, November 19, 2021. REUTERS/Soe Zeya Tun 

Children play with firework near a river, during the Loy Krathong festival which is held as a symbolic apology to the goddess of the river in Chiang Mai, Thailand, November 19, 2021. REUTERS/Soe Zeya Tun 

People take photos during the Loy Krathong festival which is held as a symbolic apology to the goddess of the river in Chiang Mai, Thailand, November 19, 2021. REUTERS/Soe Zeya Tun 

People gather to place krathongs (floating baskets) into a river during the Loy Krathong festival which is held as a symbolic apology to the goddess of the river in Chiang Mai, Thailand, November 19, 2021. REUTERS/Soe Zeya Tun 

An AirAsia airplane is seen at the airport of popular tourist destination Chiang Mai, as the country reopens its borders to vaccinated tourists in Bangkok, Thailand November 16, 2021. Picture taken on November 16, 2021. REUTERS/Soe Zeya Tun 

Anon Nampa, one of the leaders of recent anti-government protests takes off his own mask during a demonstration demanding the resignation of Thailand's Prime Minister Prayuth Chan-ocha in Chiang Mai, Thailand, August 9, 2020. REUTERS/Athit Perawongmetha 

Anti-goverment protesters hold up masks of Anon Nampa, one of the leaders during a demonstration demanding the resignation of Thailand's Prime Minister Prayuth Chan-ocha in Chiang Mai, Thailand, August 9, 2020. REUTERS/Athit Perawongmetha 

A mask of Anon Nampa, one of the leaders is seen in front of anti-government protesters during a demonstration demanding the resignation of Thailand's Prime Minister Prayuth Chan-ocha in Chiang Mai, Thailand, August 9, 2020. REUTERS/Athit Perawongmetha 

Anon Nampa, one of the leaders of recent anti-government protests speaks during a demonstration demanding the resignation of Thailand's Prime Minister Prayuth Chan-ocha in Chiang Mai, Thailand, August 9, 2020. REUTERS/Athit Perawongmetha 

Anon Nampa, one of the leaders of recent anti-government protests speaks during a demonstration demanding the resignation of Thailand's Prime Minister Prayuth Chan-ocha in Chiang Mai, Thailand, August 9, 2020. REUTERS/Athit Perawongmetha 

Anon Nampa, one of the leaders of recent anti-government protests speaks during a demonstration demanding the resignation of Thailand's Prime Minister Prayuth Chan-ocha in Chiang Mai, Thailand, August 9, 2020. REUTERS/Athit Perawongmetha 

An anti-government protester wearing a mask of Anon Nampa, one of the leaders flashes a three-fingers salute during a demonstration demanding the resignation of Thailand's Prime Minister Prayuth Chan-ocha in Chiang Mai, Thailand, August 9, 2020. REUTERS/Athit Perawongmetha 

An annti-government protester holds up a placard during a demonstration demanding the resignation of Thailand's Prime Minister Prayuth Chan-ocha in Chiang Mai, Thailand, August 9, 2020. REUTERS/Athit Perawongmetha 

An ethnic Kayan hill tribe refugee woman, also known as long neck woman, knits inside their tourist attraction village near Chiang Mai, Thailand December 23, 2019. REUTERS/Jorge Silva 

An ethnic Kayan hill tribe refugee woman, also known as long neck woman, cooks at her hut inside their tourist attraction village near Chiang Mai, Thailand December 23, 2019. REUTERS/Jorge Silva 

An ethnic Kayan hill tribe refugee girl, also known as long neck woman, poses at her tourist attraction village near Chiang Mai, Thailand December 23, 2019. REUTERS/Jorge Silva TPX IMAGES OF THE DAY 

An ethnic Kayan hill tribe refugee girl, also known as long neck woman, poses at her tourist attraction village near Chiang Mai, Thailand December 23, 2019. REUTERS/Jorge Silva 

An ethnic Kayan hill tribe refugee woman, also known as long neck woman, poses at her tourist attraction village near Chiang Mai, Thailand December 23, 2019. REUTERS/Jorge Silva 

An ethnic Kayan hill tribe refugee woman, also known as long neck woman, sits with her baby inside their tourist attraction village near Chiang Mai, Thailand December 23, 2019. REUTERS/Jorge Silva 

An ethnic Kayan hill tribe refugee woman, also known as long neck woman, poses at her tourist attraction village near Chiang Mai, Thailand December 23, 2019. REUTERS/Jorge Silva 

An ethnic Kayan hill tribe refugee woman, also known as long neck woman, poses at her tourist attraction village near Chiang Mai, Thailand December 23, 2019. REUTERS/Jorge Silva 

Public health banners alerting about swine fever is seen in Chiang Rai, Thai side of the Golden Triangle, triple border between Thailand, Myanmar and Laos separated by Mekong river May 16, 2019. REUTERS/Jorge Silva 

Public health banners alerting about swine fever is seen in Chiang Rai, Thai side of the Golden Triangle, triple border between Thailand, Myanmar and Laos separated by Mekong river May 16, 2019. REUTERS/Jorge Silva 

A Buddhist monk sits in a coffee shop at the airport in Chiang Rai ,Thailand May 16, 2019. REUTERS/Jorge Silva 

Taiwan Navy personnel salute on a Ching Chiang class (Jin-Jiang) Feng Chiang (PG-607) patrol ship after Hai-an No. 10 maritime exercises, simulating fending off terror attacks and invasion at Taipei Port, New Taipei City, Taiwan May 4, 2019. REUTERS/Tyrone Siu 

A Navy Ching Chiang class (Jin-Jiang) Feng Chiang (PG-607) patrol ship (C) takes part in Hai-an No. 10 maritime exercises, simulating fending off terror attacks and invasion outside Taipei Port, New Taipei City, Taiwan May 4, 2019. REUTERS/Tyrone Siu 

Forest fire smoke rises over a mountain outside Chiang Mai, Thailand April 3, 2019. REUTERS/Soe Zeya Tun 

Men wearing masks are seen as they work near ancient palace in Chiang Mai, Thailand April 3, 2019. REUTERS/Soe Zeya Tun 

A woman wearing a mask rides her bike in Chiang Mai, Thailand April 3, 2019. REUTERS/Soe Zeya Tun 

Motorists travel on a road during a hazy day in Chiang Mai, Thailand April 3, 2019. REUTERS/Soe Zeya Tun 

A woman wears a mask as she prepares to open her shop in Chiang Mai, Thailand April 3, 2019. REUTERS/Soe Zeya Tun 

A man wears mask as he sweeps the ground near a palace in Chiang Mai, Thailand April 3, 2019. REUTERS/Soe Zeya Tun 

A man wears a mask as he uses his phone at airport in Chiang Mai, Thailand April 3, 2019. REUTERS/Soe Zeya Tun 

A woman wears a mask as she rides her bike in Chiang Mai, Thailand April 3, 2019. REUTERS/Soe Zeya Tun 

A man wears a mask as he walks near a palace in Chiang Mai, Thailand April 3, 2019. REUTERS/Soe Zeya Tun 

The construction site of a government luxury housing project earmarked as homes for judges on land in the foothills of Doi Suthep mountains is seen in Chiang Mai, Thailand May 6, 2018. REUTERS/Panu Wongcha-um 

Marian a retiree from San Francisco, California walks in a garden while staying at the Care Resort in Chiang Mai, Thailand April 5, 2018. Picture taken April 5, 2018. REUTERS/Jorge Silva 

A group of retired foreigners attend a Tai Chi class, while staying at the Care Resort in Chiang Mai, Thailand April 6, 2018. Picture taken April 6, 2018. REUTERS/Jorge Silva 

Charles, a retiree from England rides a golf car after having dinner, while staying at the Care Resort in Chiang Mai, Thailand April 5, 2018. Picture taken April 5, 2018. REUTERS/Jorge Silva 

Bryan Walker a retiree from England reads outside his room while staying at the Care Resort in Chiang Mai, Thailand April 5, 2018. Picture taken April 5, 2018. REUTERS/Jorge Silva 

A retired couple walk while staying at the Care Resort in Chiang Mai, Thailand April 6, 2018. Picture taken April 6, 2018. REUTERS/Jorge Silva 

Charles, a retiree from England has breakfast in bed, while staying at the Care Resort in Chiang Mai, Thailand April 6, 2018. Picture taken April 6, 2018. REUTERS/Jorge Silva 

Wolfgang, 96, from Switzerland is helped to walk by two nurses, while staying at the Care Resort in Chiang Mai, Thailand April 6, 2018. Picture taken April 6, 2018. REUTERS/Jorge Silva 

A group of retired foreigners attend a Tai Chi class, while staying at the Care Resort in Chiang Mai, Thailand April 6, 2018. Picture taken April 6, 2018. REUTERS/Jorge Silva 

Retired foreigners Charles (L) and Edward have dinner, while staying at the Care Resort in Chiang Mai, Thailand April 5, 2018. Picture taken April 5, 2018. REUTERS/Jorge Silva 

A retired woman is helped by a nurse, while staying at the Care Resort in Chiang Mai, Thailand April 6, 2018. Picture taken April 6, 2018. REUTERS/Jorge Silva 

A retired woman is helped by a nurse, while staying at the Care Resort in Chiang Mai, Thailand April 6, 2018. Picture taken April 6, 2018. REUTERS/Jorge Silva 

A retired woman is helped by a nurse, while staying at the Care Resort in Chiang Mai, Thailand April 6, 2018. Picture taken April 6, 2018. REUTERS/Jorge Silva 

A Thai Airways flight attendant dressed in traditional costume welcomes passengers onboard, as interest for historical clothing rises within the country, in Chiang Mai, Thailand April 6, 2018. Picture taken April 6, 2018. REUTERS/Jorge Silva 

A Thai Airways flight attendant dressed in traditional Thai costume serves passengers, as interest for historical clothing rises within the country, in a flight between Chiang Mai and Bangkok, Thailand April 6, 2018. Picture taken April 6, 2018. REUTERS/Jorge Silva 

Women prisoners attend a Thai massage class at Chiang Mai Women's Correctional Institute, in Chiang Mai, Thailand, January 24, 2018. Picture taken January 24, 2018. REUTERS/Athit Perawongmetha TPX IMAGES OF THE DAY 

Women prisoners are seen during their lunch at Chiang Mai Women's Correctional Institute, in Chiang Mai, Thailand, January 24, 2018. Picture taken January 24, 2018. REUTERS/Athit Perawongmetha 

Women prisoners attend a computer class at Chiang Mai Women's Correctional Institute, in Chiang Mai, Thailand, January 24, 2018. Picture taken January 24, 2018. REUTERS/Athit Perawongmetha 

Women prisoners embroider cloths at Chiang Mai Women's Correctional Institute, in Chiang Mai, Thailand, January 24, 2018. Picture taken January 24, 2018. REUTERS/Athit Perawongmetha