Major General Majok Michael Chan of the South Sudan People's Defence Forces (SSPDF) presides over the case of Private Yak Garang Yak, who is accused of killing three Syrian construction workers of a Lebanese company and a South Sudanese guard at a construction site in the town of Akon, Warrap state, at a military court in Juba, South Sudan January 27, 2023. REUTERS/Samir Bol 

Maj. Gen. Lul Ruai Koang, spokesperson of the South Sudan People's Defence Forces (SSPDF), addresses the media after Private Yak Garang Yak, accused of killing three Syrian construction workers of a Lebanese company and a South Sudanese guard at a construction site in the town of Akon, Warrap state, appeared in the dock at a military court in Juba, South Sudan January 27, 2023. REUTERS/Samir Bol 

Major General Majok Michael Chan of the South Sudan People's Defence Forces (SSPDF) presides over the case of Private Yak Garang Yak, who is accused of killing three Syrian construction workers of a Lebanese company and a South Sudanese guard at a construction site in the town of Akon, Warrap state, at a military court in Juba, South Sudan January 27, 2023. REUTERS/Samir Bol 

South Sudan People's Defence Forces (SSPDF), soldier Private Yak Garang Yak, accused of killing three Syrian construction workers of a Lebanese company and a South Sudanese guard at a construction site in the town of Akon, Warrap state, sits in the dock at a military court in Juba, South Sudan January 27, 2023. REUTERS/Samir Bol 

Major General Majok Michael Chan of the South Sudan People's Defence Forces (SSPDF), presides over the case of Private Yak Garang Yak, who is accused of killing three Syrian construction workers of a Lebanese company and a South Sudanese guard at a construction site in the town of Akon, Warrap state, at a military court in Juba, South Sudan January 27, 2023. REUTERS/Samir Bol 

South Sudan People's Defence Forces (SSPDF) soldier Private Yak Garang Yak, accused of killing three Syrian construction workers of a Lebanese company and a South Sudanese guard at a construction site in the town of Akon, Warrap state, sits in the dock at a military court in Juba, South Sudan January 27, 2023. REUTERS/Samir Bol 

A bull is seen in a breeding farm near Arles, France, November 20, 2022. REUTERS/Eric Gaillard 

People walks past a Yakovlev Yak-42 airliner displayed at the Exhibition of Achievements of National Economy (VDNH) in Moscow, Russia September 10, 2022. REUTERS/Evgenia Novozhenina 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

Director Pawo Choyning Dorji, whose film "Lunana: A Yak in the Classroom" is nominated for an Oscar, poses before the 94th Academy Awards in Los Angeles, California, U.S., March 21, 2022. REUTERS/Lauren Justice 

A man herds yaks near Noijin Kangsang mountain in Gyangze County, during a government-organised tour of the Tibet Autonomous Region, China, October 18, 2020. Picture taken October 18, 2020. REUTERS/Thomas Peter 

A yak herder walks on a plain near Noijin Kangsang mountain in Gyangze County, during a government-organised tour of the Tibet Autonomous Region, China, October 18, 2020. Picture taken October 18, 2020. REUTERS/Thomas Peter 

Yaks stand in front of Noijin Kangsang mountain in Gyangze County, during a government-organised tour of the Tibet Autonomous Region, China, October 18, 2020. Picture taken October 18, 2020. REUTERS/Thomas Peter 

A man herds yaks near Noijin Kangsang mountain in Gyangze County, during a government-organised tour of the Tibet Autonomous Region, China, October 18, 2020. Picture taken October 18, 2020. REUTERS/Thomas Peter 

Antonov An-26F and Yak-130 aircrafts fly during the Victory Day parade, which marks the anniversary of the victory over Nazi Germany in World War Two, amid the coronavirus disease (COVID-19) outbreak, in Minsk, Belarus May 9, 2020. REUTERS/Vasily Fedosenko 

Afghan National Army forces go towards the site of an airplane crash in Deh Yak district of Ghazni province, Afghanistan January 27, 2020. REUTERS/Mustafa Andaleb 

Afghan National Army forces go towards the site of an airplane crash in Deh Yak district of Ghazni province, Afghanistan January 27, 2020. REUTERS/Mustafa Andaleb 

Afghan National Army forces go towards the site of an airplane crash in Deh Yak district of Ghazni province, Afghanistan January 27, 2020. REUTERS/Mustafa Andaleb 

Afghan National Army forces go towards the site of an airplane crash in Deh Yak district of Ghazni province, Afghanistan January 27, 2020. REUTERS/Mustafa Andaleb 

Afghan National Army forces go towards the site of an airplane crash in Deh Yak district of Ghazni province, Afghanistan January 27, 2020. REUTERS/Mustafa Andaleb 

Nyima, a 17-year-old Tibetan, tethers his family's herd of yaks for the day on a grassland in Madoi county, Golog Tibetan Autonomous Prefecture, Qinghai province, China September 1, 2019. Picture taken September 1, 2019. REUTERS/Ryan Woo 

Lhamo, a 38-year-old Tibetan woman and wife of a herdsman, gathers yak dung that will be dried and used as a source of fuel for cooking, on a grassland in Madoi county, Golog Tibetan Autonomous Prefecture, Qinghai province, China September 2, 2019. Picture taken September 2, 2019. REUTERS/Ryan Woo 

Nyima, a 17-year-old Tibetan, rounds up his herd of yaks in the evening on a grassland in Madoi county, Golog Tibetan Autonomous Prefecture, Qinghai province, China September 1, 2019. Picture taken September 1, 2019. REUTERS/Ryan Woo 

Yaks walk on a mountain in the Amne Machin range in China’s western Qinghai province, June 7, 2019. REUTERS/Aly Song 

A Tibetan herder leads his yaks through a mountain in the Amne Machin range in China’s western Qinghai province, June 7, 2019. REUTERS/Aly Song 

Yaks walk on a mountain in the Amne Machin range in China's western Qinghai province, June 7, 2019. Found in the Himalayas, Tibet and Qinghai's high-altitude grasslands, the caterpillar fungus, as cordyceps is also known, has become the most important source of income for local communities, offering seasonal jobs for the poor and a path to riches for commercial harvesters. REUTERS/Aly Song SEARCH "CHINA FUNGUS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A skull of a yak lies in the valley in the Amne Machin range in China's western Qinghai province, June 9, 2019. Found in the Himalayas, Tibet and Qinghai's high-altitude grasslands, the caterpillar fungus, as cordyceps is also known, has become the most important source of income for local communities, offering seasonal jobs for the poor and a path to riches for commercial harvesters. REUTERS/Aly Song SEARCH "CHINA FUNGUS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Yaks graze on a grassland in Madoi county, Golog Tibetan Autonomous Prefecture, Qinghai province, China September 1, 2019. Picture taken September 1, 2019. REUTERS/Ryan Woo TPX IMAGES OF THE DAY 

Spanish pilot Salva Ballesta flies with his Soviet-made Yakovlev Yak-52 plane over a beach during an international airshow in Torre del Mar, near Malaga, southern Spain, July 30, 2017. REUTERS/Jon Nazca 

Russian Yak-130 advanced trainer aircraft fly in formation above St. Basil's Cathedral during a rehearsal for the Victory Day parade, marking the 72nd anniversary of the victory over Nazi Germany in World War Two, in central Moscow, Russia May 4, 2017. REUTERS/Tatyana Makeyeva 

A combination photo shows former BSI Bankers Yak Yew Chee and Yvonne Seah Yew Foong leaving the State Courts in Singapore October 10, 2016. REUTERS/Edgar Su

Former BSI banker Yak Yew Chee leaves the State Courts in Singapore October 10, 2016. REUTERS/Edgar Su 

Former BSI banker Yak Yew Chee leaves the State Courts in Singapore October 10, 2016. REUTERS/Edgar Su 

Former BSI banker Yak Yew Chee leaves the State Courts in Singapore October 10, 2016. REUTERS/Edgar Su 

Former BSI banker Yak Yew Chee leaves the State Courts with lawyer Lee Teck Leng in Singapore October 10, 2016. REUTERS/Edgar Su 

A Yakovlev Yak-130 combat trainer aircraft performs during the International Army Games 2016, in Dubrovichi outside Ryazan, Russia, August 5, 2016. REUTERS/Maxim Shemetov 

A Yakovlev Yak-130 combat trainer aircraft performs during the International Army Games 2016, in Dubrovichi outside Ryazan, Russia, August 5, 2016. REUTERS/Maxim Shemetov 

Pilots in Yak-52 plane perform during an airshow on the outskirts of Minsk, Belarus June 4, 2016. REUTERS/Vasily Fedosenko 

Roderick Edward Martin, a lawyer representing BSI private banker Yak Yew Chee, leaves the High Court after a hearing on a request by Yak to release money from his bank account which was frozen as part of Singapore's money laundering probe linked to 1Malaysia Development Berhad (1MDB), in Singapore February 5, 2016. REUTERS/Edgar Su 

Roderick Edward Martin, a lawyer representing BSI private banker Yak Yew Chee, leaves the High Court after a hearing on a request by Yak to release money from his bank account which was frozen as part of Singapore's money laundering probe linked to 1Malaysia Development Berhad (1MDB), in Singapore February 5, 2016. REUTERS/Edgar Su 

Roderick Edward Martin, a lawyer representing BSI private banker Yak Yew Chee, leaves the High Court after a hearing on a request by Yak to release money from his bank account which was frozen as part of Singapore's money laundering probe linked to 1Malaysia Development Berhad (1MDB), in Singapore February 5, 2016. REUTERS/Edgar Su 

Phurbha Tashi Sherpa, 21-time Everest summiteer, feeds potatoes to his yak at Khumjung, a typical Sherpa village in Solukhumbu district also known as the Everest region, in this picture taken November 30, 2015. To match Insight QUAKE-NEPAL/SHERPAS REUTERS/Navesh Chitrakar 

Phurbha Tashi Sherpa, 21-time Everest summiteer, carries a sack of potatoes as he heads to feed his yaks at Khumjung, a typical Sherpa village in Solukhumbu district also known as the Everest region, in this picture taken November 30, 2015. To match Insight QUAKE-NEPAL/SHERPAS REUTERS/Navesh Chitrakar 

Pilgrims have hot yak butter tea after visiting the Jokhang Temple in central Lhasa, Tibet Autonomous Region, China November 20, 2015. Every day thousands of Tibetans visit and pray at Jokhang Temple, considered one of the most sacred place of worship. REUTERS/Damir Sagolj 

A tourist takes pictures while riding a yak held by a Tibetan man at Namtso lake in the Tibet Autonomous Region, China November 18, 2015. Located four hours' drive from Lhasa at an altitude of around 4,718m (15,479 ft) above sea level, Namtso lake is not only the highest saltwater lake in the world but also considered sacred, attracting throngs of devotees and pilgrims. REUTERS/Damir Sagolj 

Tourist take pictures of Tibetan people and their yaks as they visit Namtso lake in the Tibet Autonomous Region, China November 18, 2015. Located four hours' drive from Lhasa at an altitude of around 4,718m (15, 479 ft) above sea level, Namtso lake is not only the highest saltwater lake in the world but also considered sacred, attracting throngs of devotees and pilgrims. REUTERS/Damir Sagolj 

Decorated yak skulls are offered for sale at a shop in the old part of Lhasa, Tibet Autonomous Region, China November 16, 2015 . REUTERS/Damir Sagolj